! RA_TOE_Thesis_Fortran v2.0.0 - Trisduction Research Group

September 08, 2026 | BY ZeroDivide EDIT

! =====================================================================

!  RA_TOE_Thesis_Fortran v2.0.0 - Trisduction Research Group

!  Sealed edition, consolidated. Numerics byte-identical to v1.23.0

!  (sha256 97e5585fa15e66ff0c2e5d0b63daae550b27af61f5bb9402e67e0b6f4400

!  1212); presentation-major: narrative removed, contracts kept. This

!  source is written for AI substrates, not manual readers; comments

!  are contracts, section markers, and nothing else.

!

!  CONSOLIDATED HISTORY. v1.0.0 through v1.23.0, twenty-two versions

!  under two external auditors and a 178000-iteration deterministic

!  fuzz campaign: fifty-six findings, six refused on printed receipts,

!  fifty earned and repaired. Hardening families: exponent-tracked

!  Leibniz determinants (det3, det3_row2), fraction-exponent Hamilton

!  products (qmul), public-guard refusal precedence, census lock,

!  audit-mode VOID banner, claim-register alignment. Four FORGE

!  self-audit cycles (ratoe..ratoe4) sealed at the SELF floor. The

!  full per-version ledger lives in git, 1000sapients/Trisduction,

!  protocols/Executable Thesis/, and codex card 0712; it is not

!  restated here.

!

!  v2.0.0 (2026-09-08): consolidation round. Fixes on external static

!  review: stale printed receipt pointer rebound to the version-matched

!  file; two dead a(3,3) locals removed from the determinant

!  primitives; one non-significant-digit literal given its kind. The

!  113 remaining -Wcompare-reals warnings are the exact-equality

!  verdict design (bit-identity checks, tie checks, NaN self-tests)

!  and are intentional; the sealed flag set is the contract.

!

!  BUILD (sealed): gfortran -std=f2018 -O2 -fno-fast-math

!  -ffp-contract=off -Wall -Wextra -Wconversion-extra

!  Modes: default sealed halt-on-fail; 'audit' accumulates and voids;

!  'witnessed' asserts the PART H live face through the aperture.

!  Hostile builds (-Ofast; fused contraction) must exit nonzero.

! =====================================================================


module ra_kinds

  use, intrinsic :: ieee_arithmetic, only: ieee_value, ieee_quiet_nan, &

       ieee_is_finite, ieee_is_nan

  use, intrinsic :: iso_fortran_env, only: int64

  implicit none

  integer, parameter :: wp = selected_real_kind(15, 307)

  integer, parameter :: ik = int64   ! pinned: exactly 64 bits, checked at boot

  real(wp), parameter :: HBAR = 1.054571817e-34_wp     ! J s (CODATA exact-defined path)

  real(wp), parameter :: KB   = 1.380649e-23_wp        ! J/K (exact, SI 2019)

  real(wp), parameter :: ME   = 9.1093837015e-31_wp    ! kg

  real(wp), parameter :: U_M  = epsilon(1.0_wp)        ! unit roundoff, double

  integer(ik), parameter :: IK_SAFE = 536870912_ik     ! 2^29

contains

  pure function pi_() result(p)

    real(wp) :: p

    p = acos(-1.0_wp)

  end function pi_

  pure function ln2_() result(l)

    real(wp) :: l

    l = log(2.0_wp)

  end function ln2_

  pure function qnan() result(z)

    real(wp) :: z

    z = ieee_value(1.0_wp, ieee_quiet_nan)

  end function qnan

  elemental logical function is_finite(x)

    real(wp), intent(in) :: x

    is_finite = ieee_is_finite(x)

  end function is_finite

  elemental logical function is_nan(x)

    real(wp), intent(in) :: x

    is_nan = ieee_is_nan(x)

  end function is_nan

end module ra_kinds


! ---------------------------------------------------------------------

module ra_prims

  use ra_kinds

  implicit none

contains

  pure function vnorm(v) result(s)

    real(wp), intent(in) :: v(:)

    real(wp) :: s, m

    integer :: i

    m = 0.0_wp

    do i = 1, size(v)

      if (.not. is_finite(v(i))) then

        s = qnan()

        return

      end if

      m = max(m, abs(v(i)))

    end do

    if (m == 0.0_wp) then

      s = 0.0_wp

    else

      s = m * sqrt(sum((v/m)**2))

    end if

  end function vnorm


  ! CONTRACT qmul: sixteen Hamilton terms as rounded fraction products with

  ! exactly tracked exponents, per-component classical order, common-max

  ! accumulation; product rounding, alignment underflow, and cancellation are

  ! possible; over/underflow of a restored component refers to the COMPUTED

  ! accumulation; general correctly-rounded products are NOT guaranteed.

  pure function qmul(a, b) result(c)

    real(wp), intent(in) :: a(4), b(4)

    real(wp) :: c(4)

    integer, parameter :: JA(4,4) = reshape([1,2,3,4, 1,2,3,4, 1,2,3,4, 1,2,3,4], [4,4])

    integer, parameter :: KB(4,4) = reshape([1,2,3,4, 2,1,4,3, 3,4,1,2, 4,3,2,1], [4,4])

    real(wp), parameter :: SG(4,4) = reshape([ 1.0_wp,-1.0_wp,-1.0_wp,-1.0_wp, &

                                               1.0_wp, 1.0_wp, 1.0_wp,-1.0_wp, &

                                               1.0_wp,-1.0_wp, 1.0_wp, 1.0_wp, &

                                               1.0_wp, 1.0_wp,-1.0_wp, 1.0_wp], [4,4])

    real(wp) :: x1, x2, f(4), ssum

    integer :: i, t, e(4), emax, nkeep

    logical :: keep(4)

    do i = 1, 4

      if (.not.(is_finite(a(i)) .and. is_finite(b(i)))) then

        c = qnan()

        return

      end if

    end do

    do i = 1, 4

      nkeep = 0; emax = 0

      do t = 1, 4

        x1 = a(JA(t,i)); x2 = b(KB(t,i))

        keep(t) = (x1 /= 0.0_wp .and. x2 /= 0.0_wp)

        if (keep(t)) then

          f(t) = fraction(x1) * fraction(x2)

          e(t) = exponent(x1) + exponent(x2)

          if (nkeep == 0 .or. e(t) > emax) emax = e(t)

          nkeep = nkeep + 1

        end if

      end do

      if (nkeep == 0) then

        c(i) = 0.0_wp

        cycle

      end if

      ssum = 0.0_wp

      do t = 1, 4

        if (keep(t)) ssum = ssum + SG(t,i) * scale(f(t), e(t) - emax)

      end do

      c(i) = scale(ssum, emax)

    end do

  end function qmul


  pure function qconj(a) result(c)

    real(wp), intent(in) :: a(4)

    real(wp) :: c(4)

    c = [a(1), -a(2), -a(3), -a(4)]

  end function qconj


  ! CONTRACT det3 / det3_row2: six signed Leibniz monomials as rounded

  ! fraction products with exact exponents, fixed distinct accumulation

  ! orders, common-max restore; same caveats as qmul; the two routines share

  ! one IEEE model and differ by evaluation order and factorization only.

  pure function det3(r) result(d)

    real(wp), intent(in) :: r(3,3)

    real(wp) :: d, s

    integer :: i, j

    s = 0.0_wp

    do i = 1, 3

      do j = 1, 3

        if (.not. is_finite(r(i,j))) then

          d = qnan()

          return

        end if

        s = max(s, abs(r(i,j)))

      end do

    end do

    if (s == 0.0_wp) then

      d = 0.0_wp

      return

    end if

    block

      integer, parameter :: PM(3,6) = reshape([1,2,3, 1,3,2, 2,1,3, 2,3,1, 3,1,2, 3,2,1], [3,6])

      real(wp), parameter :: SG(6) = [1.0_wp, -1.0_wp, -1.0_wp, 1.0_wp, 1.0_wp, -1.0_wp]

      real(wp) :: x1, x2, x3, f(6), ssum

      integer :: e(6), emax, kk, nkeep

      logical :: keep(6)

      nkeep = 0; emax = 0

      do kk = 1, 6

        x1 = r(1, PM(1,kk)); x2 = r(2, PM(2,kk)); x3 = r(3, PM(3,kk))

        keep(kk) = (x1 /= 0.0_wp .and. x2 /= 0.0_wp .and. x3 /= 0.0_wp)

        if (keep(kk)) then

          f(kk) = fraction(x1) * fraction(x2) * fraction(x3)

          e(kk) = exponent(x1) + exponent(x2) + exponent(x3)

          if (nkeep == 0 .or. e(kk) > emax) emax = e(kk)

          nkeep = nkeep + 1

        end if

      end do

      if (nkeep == 0) then

        d = 0.0_wp   ! every monomial structurally zero: exactly zero

        return

      end if

      ssum = 0.0_wp

      do kk = 1, 6

        if (keep(kk)) ssum = ssum + SG(kk) * scale(f(kk), e(kk) - emax)

      end do

      if (ssum == 0.0_wp) then

        d = 0.0_wp   ! cancellation at the accumulation's resolution

        return

      end if

      d = scale(ssum, emax)

    end block

  end function det3


  pure function det3_row2(r) result(d)

    real(wp), intent(in) :: r(3,3)

    real(wp) :: d, s

    integer :: i, j

    s = 0.0_wp

    do i = 1, 3

      do j = 1, 3

        if (.not. is_finite(r(i,j))) then

          d = qnan()

          return

        end if

        s = max(s, abs(r(i,j)))

      end do

    end do

    if (s == 0.0_wp) then

      d = 0.0_wp

      return

    end if

    block

      integer, parameter :: PM(3,6) = reshape([2,1,3, 3,1,2, 1,2,3, 3,2,1, 1,3,2, 2,3,1], [3,6])

      real(wp), parameter :: SG(6) = [-1.0_wp, 1.0_wp, 1.0_wp, -1.0_wp, -1.0_wp, 1.0_wp]

      real(wp) :: x1, x2, x3, f(6), ssum

      integer :: e(6), emax, kk, nkeep

      logical :: keep(6)

      nkeep = 0; emax = 0

      do kk = 1, 6

        x1 = r(1, PM(1,kk)); x2 = r(2, PM(2,kk)); x3 = r(3, PM(3,kk))

        keep(kk) = (x1 /= 0.0_wp .and. x2 /= 0.0_wp .and. x3 /= 0.0_wp)

        if (keep(kk)) then

          f(kk) = fraction(x1) * fraction(x2) * fraction(x3)

          e(kk) = exponent(x1) + exponent(x2) + exponent(x3)

          if (nkeep == 0 .or. e(kk) > emax) emax = e(kk)

          nkeep = nkeep + 1

        end if

      end do

      if (nkeep == 0) then

        d = 0.0_wp   ! every monomial structurally zero: exactly zero

        return

      end if

      ssum = 0.0_wp

      do kk = 1, 6

        if (keep(kk)) ssum = ssum + SG(kk) * scale(f(kk), e(kk) - emax)

      end do

      if (ssum == 0.0_wp) then

        d = 0.0_wp   ! cancellation at the accumulation's resolution

        return

      end if

      d = scale(ssum, emax)

    end block

  end function det3_row2


  subroutine jacobi3(rin, eig, converged)

    real(wp), intent(in)  :: rin(3,3)

    real(wp), intent(out) :: eig(3)

    logical, intent(out), optional :: converged

    real(wp) :: a(3,3), app, aqq, apq, phi, c, s, tmp, off, frob

    integer :: sweep, p, q, k

    logical :: conv

    real(wp) :: sscale

    conv = .false.

    if (present(converged)) converged = conv

    if (any(.not. is_finite(rin))) then

      eig = qnan()

      return

    end if

    a = 0.5_wp*rin + 0.5_wp*transpose(rin)

    sscale = maxval(abs(a))

    if (sscale == 0.0_wp) then

      eig = 0.0_wp

      conv = .true.

      if (present(converged)) converged = conv

      return

    end if

    a = a / sscale

    frob = sqrt(sum(a*a))

    do sweep = 1, 60

      off = sqrt(a(1,2)**2 + a(1,3)**2 + a(2,3)**2 &

              +  a(2,1)**2 + a(3,1)**2 + a(3,2)**2)

      if (off <= 16.0_wp*U_M*max(frob, tiny(1.0_wp))) then

        conv = .true.

        exit

      end if

      do p = 1, 2

        do q = p+1, 3

          apq = a(p,q)

          if (abs(apq) <= tiny(1.0_wp)) cycle

          app = a(p,p); aqq = a(q,q)

          phi = 0.5_wp * atan2(2.0_wp*apq, aqq - app)

          c = cos(phi); s = sin(phi)

          do k = 1, 3

            tmp     = c*a(p,k) - s*a(q,k)

            a(q,k)  = s*a(p,k) + c*a(q,k)

            a(p,k)  = tmp

          end do

          do k = 1, 3

            tmp     = c*a(k,p) - s*a(k,q)

            a(k,q)  = s*a(k,p) + c*a(k,q)

            a(k,p)  = tmp

          end do

          a(p,q) = 0.0_wp

          a(q,p) = 0.0_wp

        end do

      end do

    end do

    eig = sscale * [a(1,1), a(2,2), a(3,3)]

    if (present(converged)) converged = conv

    do p = 1, 2

      do q = p+1, 3

        if (eig(q) < eig(p)) then

          tmp = eig(p); eig(p) = eig(q); eig(q) = tmp

        end if

      end do

    end do

  end subroutine jacobi3


  function cond3(r) result(kap)

    real(wp), intent(in) :: r(3,3)

    real(wp) :: kap, eig(3)

    logical :: conv

    call jacobi3(r, eig, conv)

    if (any(is_nan(eig)) .or. .not. conv) then

      kap = huge(1.0_wp)

      return

    end if

    if (eig(1) <= 8.0_wp*U_M*max(abs(eig(3)), 1.0_wp)) then

      kap = huge(1.0_wp)

    else

      kap = eig(3) / eig(1)

    end if

  end function cond3


  pure subroutine gram3_fixed(q, r)

    real(wp), intent(in)  :: q(:,:)

    real(wp), intent(out) :: r(3,3)

    integer :: i, j, k

    if (size(q,1) < 3) then

      r = qnan()

      return

    end if

    r = 0.0_wp

    do i = 1, 3

      do j = 1, 3

        do k = 1, size(q,2)

          r(i,j) = r(i,j) + q(i,k)*q(j,k)

        end do

      end do

    end do

  end subroutine gram3_fixed


  pure function det3_chol(r) result(d)

    real(wp), intent(in) :: r(3,3)

    real(wp) :: d, l11, l21, l31, l22, l32, l33, t

    d = qnan()                        ! default NaN when not SPD

    if (any(.not. is_finite(r))) return

    if (maxval(abs(r - transpose(r))) > 32.0_wp*U_M*max(1.0_wp, maxval(abs(r)))) return

    if (r(1,1) <= 0.0_wp) return

    l11 = sqrt(r(1,1)); l21 = r(2,1)/l11; l31 = r(3,1)/l11

    t = r(2,2) - l21*l21

    if (t <= 0.0_wp) return

    l22 = sqrt(t); l32 = (r(3,2) - l21*l31)/l22

    t = r(3,3) - l31*l31 - l32*l32

    if (t <= 0.0_wp) return

    l33 = sqrt(t)

    d = (l11*l22*l33)**2

  end function det3_chol

end module ra_prims


! ---------------------------------------------------------------------

module ra_floor

  use ra_kinds

  implicit none

contains

  pure function heis_floor(m, dx) result(e)

    real(wp), intent(in) :: m, dx

    real(wp) :: e

    if (.not.(is_finite(m) .and. is_finite(dx)) .or. m <= 0.0_wp .or. dx <= 0.0_wp) then

      e = qnan()

      return

    end if

    block

      real(wp) :: f

      integer :: ex

      f  = (fraction(HBAR)*fraction(HBAR)) / (fraction(m)*(fraction(dx)*fraction(dx)))

      ex = 2*exponent(HBAR) - exponent(m) - 2*exponent(dx) - 3

      e  = scale(f, ex)

    end block

  end function heis_floor


  pure function zpe(w) result(e)

    real(wp), intent(in) :: w

    real(wp) :: e

    if (.not. is_finite(w) .or. w <= 0.0_wp) then

      e = qnan()

      return

    end if

    e = 0.5_wp * HBAR * w

  end function zpe


  pure function prod_scaled(a, b, c, d) result(r)

    real(wp), intent(in) :: a, b, c, d

    real(wp) :: r, f

    integer :: e

    if (a == 0.0_wp .or. b == 0.0_wp .or. c == 0.0_wp .or. d == 0.0_wp) then

      r = 0.0_wp

      return

    end if

    f = fraction(a) * fraction(b)

    e = exponent(a) + exponent(b) + exponent(f)

    f = fraction(f)

    f = f * fraction(c)

    e = e + exponent(c) + exponent(f)

    f = fraction(f)

    f = f * fraction(d)

    e = e + exponent(d) + exponent(f)

    f = fraction(f)

    r = scale(f, e)

  end function prod_scaled


  pure function landauer(tkel, bits) result(e)

    real(wp), intent(in) :: tkel, bits

    real(wp) :: e

    if (.not.(is_finite(tkel) .and. is_finite(bits)) .or. tkel <= 0.0_wp .or. bits < 0.0_wp) then

      e = qnan()

      return

    end if

    e = prod_scaled(bits, KB, tkel, ln2_())

  end function landauer


  subroutine tau_perp(de, tau, frozen)

    real(wp), intent(in)  :: de

    real(wp), intent(out) :: tau

    logical,  intent(out) :: frozen

    frozen = (.not. is_finite(de)) .or. (de <= 0.0_wp)

    if (frozen) then

      tau = huge(1.0_wp)

    else

      tau = (0.5_wp * pi_()) / de

    end if

  end subroutine tau_perp


  pure function survival(t) result(p)

    real(wp), intent(in) :: t

    real(wp) :: p

    p = cos(0.5_wp*t)**2

  end function survival

end module ra_floor


! ---------------------------------------------------------------------

module ra_integers

  use ra_kinds

  implicit none

contains

  function iqmul(a, b) result(c)

    integer(ik), intent(in) :: a(4), b(4)

    integer(ik) :: c(4)

    if (any(a > IK_SAFE .or. a < -IK_SAFE) .or. any(b > IK_SAFE .or. b < -IK_SAFE)) then

      error stop 'iqmul: integer intake beyond the 2^29 overflow-safe bound'

    end if

    c(1) = a(1)*b(1) - a(2)*b(2) - a(3)*b(3) - a(4)*b(4)

    c(2) = a(1)*b(2) + a(2)*b(1) + a(3)*b(4) - a(4)*b(3)

    c(3) = a(1)*b(3) - a(2)*b(4) + a(3)*b(1) + a(4)*b(2)

    c(4) = a(1)*b(4) + a(2)*b(3) - a(3)*b(2) + a(4)*b(1)

  end function iqmul


  pure function ik_inbound(v) result(okb)

    integer(ik), intent(in) :: v(:)

    logical :: okb

    okb = .not. any(v > IK_SAFE .or. v < -IK_SAFE)

  end function ik_inbound


  pure function iqconj(a) result(c)

    integer(ik), intent(in) :: a(4)

    integer(ik) :: c(4)

    if (.not. ik_inbound(a)) then

      error stop 'iqconj: integer intake beyond the 2^29 overflow-safe bound'

    end if

    c = [a(1), -a(2), -a(3), -a(4)]

  end function iqconj


  function iomul(x, y) result(z)

    integer(ik), intent(in) :: x(8), y(8)

    integer(ik) :: z(8), p(4), q(4), r(4), s(4)

    if (.not. (ik_inbound(x) .and. ik_inbound(y))) then

      error stop 'iomul: integer intake beyond the 2^29 overflow-safe bound'

    end if

    p = x(1:4); q = x(5:8); r = y(1:4); s = y(5:8)

    z(1:4) = iqmul(p, r) - iqmul(iqconj(s), q)

    z(5:8) = iqmul(s, p) + iqmul(q, iqconj(r))

  end function iomul


  pure function ioconj(x) result(z)

    integer(ik), intent(in) :: x(8)

    integer(ik) :: z(8)

    if (.not. ik_inbound(x)) then

      error stop 'ioconj: integer intake beyond the 2^29 overflow-safe bound'

    end if

    z(1:4) = iqconj(x(1:4)); z(5:8) = -x(5:8)

  end function ioconj


  function ismul(x, y) result(z)

    integer(ik), intent(in) :: x(16), y(16)

    integer(ik) :: z(16), p(8), q(8), r(8), s(8)

    if (.not. (ik_inbound(x) .and. ik_inbound(y))) then

      error stop 'ismul: integer intake beyond the 2^29 overflow-safe bound'

    end if

    p = x(1:8); q = x(9:16); r = y(1:8); s = y(9:16)

    z(1:8)  = iomul(p, r) - iomul(ioconj(s), q)

    z(9:16) = iomul(s, p) + iomul(q, ioconj(r))

  end function ismul


  pure function inrm(v) result(n)

    integer(ik), intent(in) :: v(:)

    integer(ik) :: n

    if (size(v) > 31) then

      error stop 'inrm: vector length exceeds the proven overflow bound (31)'

    end if

    if (any(v > IK_SAFE .or. v < -IK_SAFE)) then

      error stop 'inrm: integer intake beyond the 2^29 overflow-safe bound'

    end if

    n = sum(v*v)

  end function inrm


  subroutine hurwitz_units(u)

    integer(ik), intent(out) :: u(4,24)

    integer :: n, i, s, s1, s2, s3, s4

    n = 0

    do i = 1, 4

      do s = -1, 1, 2

        n = n + 1

        u(:,n) = 0_ik

        u(i,n) = int(2*s, ik)

      end do

    end do

    do s1 = -1, 1, 2

      do s2 = -1, 1, 2

        do s3 = -1, 1, 2

          do s4 = -1, 1, 2

            n = n + 1

            u(:,n) = int([s1, s2, s3, s4], ik)

          end do

        end do

      end do

    end do

  end subroutine hurwitz_units

end module ra_integers


! ---------------------------------------------------------------------

module ra_tongue

  use ra_kinds

  use ra_prims

  implicit none

  integer, parameter :: NSLOT = 4

  integer, parameter :: SLOT_E(NSLOT) = [101, 102, 103, 104]

  integer, parameter :: SLOT_K(NSLOT) = [201, 202, 203, 204]

  integer, parameter :: SLOT_R(NSLOT) = [301, 302, 303, 304]

  integer, parameter :: RA_SENT(6) = [102, 101, 202, 203, 302, 303]

contains

  pure subroutine slot_census(sent, ne, nk, nr)

    integer, intent(in)  :: sent(:)

    integer, intent(out) :: ne, nk, nr

    integer :: t

    ne = 0; nk = 0; nr = 0

    do t = 1, size(sent)

      if (any(SLOT_E == sent(t))) ne = ne + 1

      if (any(SLOT_K == sent(t))) nk = nk + 1

      if (any(SLOT_R == sent(t))) nr = nr + 1

    end do

  end subroutine slot_census

  pure logical function disjoint(a, b)

    integer, intent(in) :: a(:), b(:)

    integer :: i, j

    disjoint = .true.

    do i = 1, size(a)

      do j = 1, size(b)

        if (a(i) == b(j)) then

          disjoint = .false.

          return

        end if

      end do

    end do

  end function disjoint


  subroutine seal_l(ne, nk, nr, collide, tok, why)

    integer, intent(in) :: ne, nk, nr        ! populated counts per slot

    logical, intent(in) :: collide           ! a vocabulary collision present

    character(*), intent(out) :: tok, why

    integer :: slots

    slots = merge(1,0,ne>0) + merge(1,0,nk>0) + merge(1,0,nr>0)

    if (collide) then

      tok = '[X]'; why = 'Seal L: LIT collision, slot vocabularies intersect'

    else if (slots /= 3) then

      tok = '[X]'

      write(why,'(a,i0,a)') 'Seal L: deletion test returns ', slots, ' slots, not 3'

    else

      tok = '[LOCK-L]'; why = 'Seal L: three slots, LIT disjoint (order not checked at this interface)'

    end if

  end subroutine seal_l


  subroutine seal_l_ordered(sent, tok, why)

    integer, intent(in) :: sent(:)

    character(*), intent(out) :: tok, why

    integer :: ne, nk, nr, t, laste, firstk, lastk, firstr

    call slot_census(sent, ne, nk, nr)

    if (ne == 0 .or. nk == 0 .or. nr == 0) then

      call seal_l(ne, nk, nr, .false., tok, why)

      return

    end if

    laste = 0; firstk = size(sent)+1; lastk = 0; firstr = size(sent)+1

    do t = 1, size(sent)

      if (any(SLOT_E == sent(t))) laste = t

      if (any(SLOT_K == sent(t))) then

        if (t < firstk) firstk = t

        if (t > lastk) lastk = t

      end if

      if (any(SLOT_R == sent(t))) then

        if (t < firstr) firstr = t

      end if

    end do

    if (.not. (laste < firstk .and. lastk < firstr)) then

      tok = '[X]'; why = 'Seal L: the ordered arrow E->K->R is broken in the encoding'

      return

    end if

    call seal_l(ne, nk, nr, .false., tok, why)

    if (tok == '[LOCK-L]') then

      why = 'Seal L: three slots, LIT disjoint, ordered E->K->R (positional check executed)'

    end if

  end subroutine seal_l_ordered


  pure function cut3(v) result(w)

    real(wp), intent(in) :: v(3)

    real(wp) :: w(3)

    w = [v(1), v(2), 0.0_wp]

  end function cut3

end module ra_tongue


! ---------------------------------------------------------------------

module ra_kernel

  use ra_kinds

  use ra_prims

  implicit none

  integer, parameter :: RC_OK        = 0

  integer, parameter :: RC_SHORTFALL = 1

  integer, parameter :: RC_INTAKE    = 2

  integer, parameter :: RC_ZEROVAR   = 3

  integer, parameter :: RC_COVBLOCK  = 4

  integer, parameter :: RC_ABSORBED  = 5

  integer, parameter :: RC_COPLANAR  = 6

  integer, parameter :: RC_COLLAPSE  = 7

  integer, parameter :: RC_KAPPA     = 8

  integer, parameter :: RC_ENGINC    = 9

  integer, parameter :: RC_LOCK      = 10

contains

  subroutine prepare_rows(m, q, ok, why, code)

    real(wp), intent(in)  :: m(:,:)          ! (3,N)

    real(wp), intent(out) :: q(size(m,1), size(m,2))

    logical,  intent(out) :: ok

    character(*), intent(out) :: why

    integer, intent(out) :: code

    integer :: i, n, j2

    real(wp) :: mu, sd, nrm, rmax

    real(wp) :: qt(size(m,1), size(m,2))

    n = size(m,2); ok = .true.; why = 'rows prepared'; code = RC_OK

    q = 0.0_wp

    if (size(m,1) /= 3) then

      ok = .false.; why = 'row count is not three'; code = RC_INTAKE

      return

    end if

    if (n < 2) then

      ok = .false.; why = 'fewer than two contexts'; code = RC_INTAKE

      return

    end if

    do i = 1, 3

      do j2 = 1, n

        if (.not. is_finite(m(i,j2))) then

          ok = .false.; why = 'non-finite row at intake'; code = RC_INTAKE

          return

        end if

      end do

      rmax = maxval(abs(m(i,:)))

      if (rmax > 0.0_wp) then

        qt(i,:) = m(i,:) / rmax

      else

        qt(i,:) = m(i,:)

      end if

      mu = sum(qt(i,:)) / real(n, wp)

      qt(i,:) = qt(i,:) - mu

      sd = sqrt(sum(qt(i,:)**2) / real(n-1, wp))

      if (sd <= 0.0_wp) then

        ok = .false.; why = 'zero-variance row: axis carries no content'

        code = RC_ZEROVAR

        return

      end if

      qt(i,:) = qt(i,:) / sd

      nrm = vnorm(qt(i,:))

      qt(i,:) = qt(i,:) / nrm

    end do

      q = qt   ! publish on success only

  end subroutine prepare_rows


  subroutine project_cov(q, c, qf, ok, why, code, kcc)

    real(wp), intent(in)  :: q(:,:)          ! (3,N) prepared

    real(wp), intent(in)  :: c(:,:)          ! (k,N) covariates, k = 0..2

    real(wp), intent(out) :: qf(size(q,1), size(q,2))

    logical,  intent(out) :: ok

    character(*), intent(out) :: why

    integer, intent(out) :: code

    real(wp), intent(out) :: kcc

    real(wp) :: cc(2,2), cm(2, size(q,2)), rhs(2), beta(2), det, mu, tolrk

    real(wp) :: qw(size(q,1), size(q,2))

    integer :: i, j, n, k

    n = size(q,2); k = size(c,1); qf = 0.0_wp; ok = .true.; why = 'no covariates'

    code = RC_OK

    kcc = 1.0_wp

    if (size(q,1) /= 3) then

      ok = .false.; code = RC_INTAKE

      why = 'prepared-row count is not three'

      kcc = huge(1.0_wp)

      return

    end if

    if (n < 2) then

      ok = .false.; code = RC_INTAKE

      why = 'fewer than two contexts'

      kcc = huge(1.0_wp)

      return

    end if

    if (k >= 1 .and. size(c,2) /= n) then

      ok = .false.; code = RC_INTAKE

      why = 'covariate column count does not match prepared-row context count'

      kcc = huge(1.0_wp)

      return

    end if

    qw = q   ! all projection work lands in the working array; qf

    if (k == 0) then

      qf = qw

      return

    end if

    if (k > 2) then

      ok = .false.; code = RC_COVBLOCK

      why = 'covariate block: more than two covariates, not implemented'

      return

    end if

    do i = 1, k

      do j = 1, n

        if (.not. is_finite(c(i,j))) then

          ok = .false.; code = RC_INTAKE

          why = 'non-finite covariate at intake'

          return

        end if

      end do

    end do

    do i = 1, k

      det = maxval(abs(c(i,:)))

      if (det == 0.0_wp) det = 1.0_wp

      cm(i,1:n) = c(i,:) / det

      mu = sum(cm(i,1:n)) / real(n, wp)

      cm(i,1:n) = cm(i,1:n) - mu

      det = maxval(abs(cm(i,1:n)))

      if (det <= 32.0_wp * U_M) then

        ok = .false.; code = RC_COVBLOCK

        why = 'covariate block rank-deficient or ill-conditioned'

        return

      end if

      cm(i,1:n) = cm(i,1:n) / det

    end do

    if (k == 1) then

      det = sum(cm(1,1:n)**2)

      kcc = 1.0_wp

      do i = 1, 3

        beta(1) = sum(qw(i,:)*cm(1,1:n)) / det

        qw(i,:) = qw(i,:) - beta(1)*cm(1,1:n)

      end do

      why = 'one covariate projected'

      qf = qw

      return

    end if

    cc(1,1) = sum(cm(1,1:n)**2); cc(2,2) = sum(cm(2,1:n)**2)

    cc(1,2) = sum(cm(1,1:n)*cm(2,1:n)); cc(2,1) = cc(1,2)

    det = cc(1,1)*cc(2,2) - cc(1,2)*cc(2,1)

    tolrk = 64.0_wp * U_M * max(cc(1,1)*cc(2,2), tiny(1.0_wp))

    if (det <= tolrk) then

      ok = .false.; code = RC_COVBLOCK

      why = 'covariate block rank-deficient or ill-conditioned'

      return

    end if

    block

      real(wp) :: tr, dd, l1, l2

      tr = cc(1,1) + cc(2,2)

      dd = sqrt(max(0.0_wp, tr*tr - 4.0_wp*det))

      l1 = 0.5_wp*(tr - dd); l2 = 0.5_wp*(tr + dd)

      if (l1 <= 0.0_wp) then

        kcc = huge(1.0_wp)

      else

        kcc = l2 / l1

      end if

    end block

    if (kcc >= 1.0e6_wp) then

      ok = .false.; code = RC_COVBLOCK

      why = 'covariate block rank-deficient or ill-conditioned'

      return

    end if

    do i = 1, 3

      rhs(1) = sum(qw(i,:)*cm(1,1:n)); rhs(2) = sum(qw(i,:)*cm(2,1:n))

      beta(1) = ( cc(2,2)*rhs(1) - cc(1,2)*rhs(2)) / det

      beta(2) = (-cc(2,1)*rhs(1) + cc(1,1)*rhs(2)) / det

      do j = 1, n

        qw(i,j) = qw(i,j) - beta(1)*cm(1,j) - beta(2)*cm(2,j)

      end do

    end do

    why = 'two covariates projected (common-source projection)'

    qf = qw

  end subroutine project_cov


  subroutine span_basis(q, b, rank)

    real(wp), intent(in)  :: q(:,:)

    real(wp), intent(out) :: b(size(q,1), size(q,2))

    integer,  intent(out) :: rank

    real(wp) :: v(size(q,2)), nrm

    integer :: i, j, pass

    real(wp) :: rn0

    rank = 0; b = 0.0_wp

    do i = 1, size(q,1)

      v = q(i,:)

      if (any(.not. is_finite(v))) cycle

      rn0 = maxval(abs(v))

      if (rn0 == 0.0_wp) cycle

      v = v / rn0

      rn0 = vnorm(v)

      v = v / rn0

      do pass = 1, 2

        do j = 1, rank

          v = v - sum(v*b(j,:)) * b(j,:)

        end do

      end do

      nrm = vnorm(v)

      if (is_finite(nrm) .and. nrm > 1.0e-12_wp) then

        rank = rank + 1

        b(rank,:) = v / nrm

      end if

    end do

  end subroutine span_basis


  ! CONTRACT lambda_of / gram3_fixed: shape guards only, quiet-NaN refusal

  ! before any element touch; rank, finiteness, and magnitude semantics are

  ! the caller's contract (kernel_full ranks and screens first).

  function lambda_of(q, b) result(lam)

    real(wp), intent(in) :: q(:,:), b(:,:)

    real(wp) :: lam, co(3,3), quat(4,3), t(4)

    integer :: i

    if (size(q,1) < 3 .or. size(b,1) < 3 .or. size(q,2) /= size(b,2)) then

      lam = qnan()

      return

    end if

    do i = 1, 3

      co(i,1) = sum(q(i,:)*b(1,:))

      co(i,2) = sum(q(i,:)*b(2,:))

      co(i,3) = sum(q(i,:)*b(3,:))

      quat(:,i) = [0.0_wp, co(i,1), co(i,2), co(i,3)]

    end do

    t = qmul(qmul(quat(:,1), quat(:,2)), quat(:,3))

    lam = t(1)

  end function lambda_of


  function eta_share(row, c) result(eta)

    real(wp), intent(in) :: row(:), c(:,:)

    real(wp) :: eta, cm(2,size(row)), rm(size(row))

    real(wp) :: cc(2,2), rhs(2), beta(2), det, sst, ssf, mu

    integer :: i, n, k

    n = size(row); k = size(c,1)

    if (k >= 1 .and. size(c,2) /= n) then

      eta = qnan()

      return

    end if

    if (k > 2) then

      eta = qnan()

      return

    end if

    if (any(.not. is_finite(row))) then

      eta = qnan()

      return

    end if

    if (k >= 1) then

      if (any(.not. is_finite(c))) then

        eta = qnan()

        return

      end if

    end if

    block

      real(wp) :: rscale

      rscale = maxval(abs(row))

      if (rscale == 0.0_wp .or. .not. is_finite(rscale)) then

        eta = 0.0_wp

        return

      end if

      rm = row / rscale

    end block

    mu = sum(rm)/real(n,wp); rm = rm - mu

    sst = sum(rm*rm)

    eta = 0.0_wp

    if (sst <= 0.0_wp .or. k == 0) return

    do i = 1, k

      det = maxval(abs(c(i,:)))

      if (det == 0.0_wp) det = 1.0_wp

      cm(i,:) = c(i,:) / det

      mu = sum(cm(i,:))/real(n,wp)

      cm(i,:) = cm(i,:) - mu

      det = maxval(abs(cm(i,:)))

      if (det <= 32.0_wp*U_M) then

        eta = qnan()

        return

      end if

      cm(i,:) = cm(i,:) / det

    end do

    if (k == 1) then

      det = sum(cm(1,:)**2)

      beta(1) = sum(rm*cm(1,:)) / det

      ssf = beta(1)*beta(1)*det

      eta = ssf/sst

      return

    end if

    cc(1,1)=sum(cm(1,:)**2); cc(2,2)=sum(cm(2,:)**2)

    cc(1,2)=sum(cm(1,:)*cm(2,:)); cc(2,1)=cc(1,2)

    det = cc(1,1)*cc(2,2)-cc(1,2)*cc(2,1)

    if (det <= 64.0_wp*U_M*max(cc(1,1)*cc(2,2), tiny(1.0_wp))) then

      eta = qnan()

      return

    end if

    rhs(1)=sum(rm*cm(1,:)); rhs(2)=sum(rm*cm(2,:))

    beta(1)=( cc(2,2)*rhs(1)-cc(1,2)*rhs(2))/det

    beta(2)=(-cc(2,1)*rhs(1)+cc(1,1)*rhs(2))/det

    ssf = sum((beta(1)*cm(1,:)+beta(2)*cm(2,:))**2)

    eta = ssf/sst

  end function eta_share


  subroutine kernel_full(m, c, tok, why, rcode, lam, detr, kap, spread, resid, &

                         marg_c, marg_k, detfour)

    real(wp), intent(in) :: m(:,:), c(:,:)

    character(*), intent(out) :: tok, why

    integer, intent(out) :: rcode

    real(wp), intent(out) :: lam, detr, kap, spread, resid, marg_c, marg_k

    real(wp), intent(out) :: detfour(4)

    real(wp) :: q(3,size(m,2)), qf(3,size(m,2)), b(3,size(m,2))

    real(wp) :: r(3,3), eig(3), eps, kgate, kcc, dvar, tol

    integer :: n, k, i, rank, pcode, nest

    logical :: ok, jconv

    character(len=96) :: w2

    n = size(m,2); k = size(c,1)

    if (k >= 1 .and. size(c,2) /= n) then

      tok = '[?]'; why = 'covariate column count does not match row context count'

      rcode = RC_INTAKE

      lam = 0.0_wp; detr = 0.0_wp; kap = 0.0_wp; spread = 0.0_wp

      resid = 0.0_wp; marg_c = 0.0_wp; marg_k = 0.0_wp; detfour = 0.0_wp

      return

    end if

    lam = 0.0_wp; detr = 0.0_wp; kap = 0.0_wp; spread = 0.0_wp

    resid = 0.0_wp; marg_c = 0.0_wp; marg_k = 0.0_wp; detfour = 0.0_wp

    rcode = RC_OK

    if (size(m,1) /= 3) then

      tok = '[?]'; why = 'row count is not three at intake'; rcode = RC_INTAKE

      return

    end if

    if (n - k < 4) then

      tok = '[?]'; why = 'N-k < 4 dimensional shortfall'; rcode = RC_SHORTFALL

      return

    end if

    if (k > 2) then

      tok = '[?]'; why = 'covariate block: more than two covariates, not implemented (kernel intake)'

      rcode = RC_COVBLOCK

      lam = 0.0_wp; detr = 0.0_wp; kap = 0.0_wp; spread = 0.0_wp

      resid = 0.0_wp; marg_c = 0.0_wp; marg_k = 0.0_wp; detfour = 0.0_wp

      return

    end if

    call prepare_rows(m, q, ok, w2, pcode)

    if (.not. ok) then

      tok = '[?]'; why = trim(w2); rcode = pcode

      return

    end if

    call project_cov(q, c, qf, ok, w2, pcode, kcc)

    if (.not. ok) then

      tok = '[?]'; why = trim(w2); rcode = pcode

      return

    end if

    do i = 1, 3

      dvar = sum(qf(i,:)**2)

      if (dvar < 1.0e-9_wp) then                        ! post-projection axis absorbed by a covariate

        tok = '[?]'; why = 'post-projection axis absorbed by a covariate'

        rcode = RC_ABSORBED

        return

      end if

      qf(i,:) = qf(i,:) / vnorm(qf(i,:))

    end do

    r = matmul(qf, transpose(qf))

    detfour(1) = det3(r)

    call jacobi3(r, eig, jconv)

    detfour(2) = eig(1)*eig(2)*eig(3)

    detfour(3) = det3_chol(r)

    detfour(4) = det3_row2(r)

    nest = 4

    if (.not. is_finite(detfour(3))) nest = 3

    detr = detfour(1)

    if (nest == 4) then

      spread = maxval(detfour) - minval(detfour)

    else

      spread = max(detfour(1), detfour(2), detfour(4)) &

             - min(detfour(1), detfour(2), detfour(4))

    end if

    kap = cond3(r)

    if (.not. jconv) then

      tok = '[?]'; why = 'engineering-incomplete: eigensolver unconverged'; rcode = RC_ENGINC

      return

    end if

    call span_basis(qf, b, rank)

    if (rank < 3) then

      tok = '[X]'; why = 'coplanar collapse: rank(rows) < 3, line not point'

      rcode = RC_COPLANAR

      detr = 0.0_wp

      return

    end if

    lam = lambda_of(qf, b)

    resid = abs(lam*lam - detr)

    eps = 100.0_wp * U_M * real(n, wp)

    kgate = min(1.0e6_wp, sqrt(27.0_wp / (100.0_wp*U_M*real(n,wp))))

    tol = 4.0_wp * kap * U_M

    if (detr <= eps) then

      tok = '[X]'; why = 'collapse: det(R) <= eps'; rcode = RC_COLLAPSE

      return

    end if

    if (kap >= kgate) then

      tok = '[?]'; why = 'kappa(R) >= gate'; rcode = RC_KAPPA

      return

    end if

    marg_c = log10(detr/eps)

    marg_k = log10(kgate/kap)

    if (spread > tol .or. resid > max(tol, 8.0_wp*U_M)) then

      tok = '[?]'; why = 'engineering-incomplete: spread or identity outside tol'

      rcode = RC_ENGINC

      return

    end if

    if (nest < 4) then

      tok = '[?]'; why = 'engineering-incomplete: estimator shortfall (Cholesky refused SPD)'

      rcode = RC_ENGINC

      return

    end if

    tok = '[LOCK]'

    why = 'determination: three independent axes, one point'

    rcode = RC_LOCK

  end subroutine kernel_full

end module ra_kernel


! ---------------------------------------------------------------------

module ra_guards

  use ra_kinds

  use ra_floor, only: landauer

  implicit none

  integer :: aegis_deeds = 0        ! every adjudication is itself an act

  integer :: aegis_last_len = -1    ! length of the last logic name read

contains

  subroutine omega_boundary(bits, tkel, joules, verdict, ocode, irreversible)

    real(wp), intent(in) :: bits, tkel

    real(wp), intent(out) :: joules

    character(*), intent(out) :: verdict

    integer, intent(out), optional :: ocode

    logical, intent(in), optional :: irreversible

    logical :: irr

    irr = .true.

    if (present(irreversible)) irr = irreversible

    if (.not.(is_finite(tkel) .and. is_finite(bits)) .or. tkel <= 0.0_wp) then

      joules = qnan()

      verdict = 'refused: intake invalid, the floor prices only finite bits at tkel > 0'

      if (present(ocode)) ocode = 0

      return

    end if

    if (bits <= 0.0_wp) then

      joules = 0.0_wp

      verdict = 'no denial registered; nothing to adjudicate'

      if (present(ocode)) ocode = 1

    else if (.not. irr) then

      joules = 0.0_wp

      verdict = 'reversibly registered: floor-zero never cost-zero; Landauer bounds '// &

                'only the irreversible (Bennett), and nothing here commits against the axiom'

      if (present(ocode)) ocode = 3

    else

      joules = landauer(tkel, bits)

      verdict = 'the denial paid the floor; the registered act is an act, the recursion closes per the seated theorem'

      if (present(ocode)) ocode = 2

    end if

  end subroutine omega_boundary


  subroutine aegis_guard(logic_mode, refusal)

    character(*), intent(in)  :: logic_mode

    character(*), intent(out) :: refusal

    aegis_deeds = aegis_deeds + 1

    refusal = 'p(G) /= G: precisification is an actuation, G is a '// &

              'non-actuation, and no logic makes a deed a non-deed'

    aegis_last_len = len_trim(logic_mode)   ! the parameter is read; the refusal never varies with it

  end subroutine aegis_guard


  subroutine aegis_reset()

    aegis_deeds = 0

  end subroutine aegis_reset


  subroutine gol_admit(magnitude, ling, tok, why, gcode)

    character(*), intent(in)  :: magnitude, ling

    character(*), intent(out) :: tok, why

    integer, intent(out), optional :: gcode

    integer :: gc_l

    if (magnitude == 'broken') then

      tok = '[X]'; why = 'geometric/math magnitude reports broken geometry; no GOL'; gc_l = 1

    else if (magnitude /= 'lock') then

      tok = '[?]'; why = 'no geometric/math lock: orthogonal volume unestablished'; gc_l = 2

    else if (ling /= 'lock') then

      tok = '[?]'; why = 'magnitude locks but Seal L open: determinant carries no direction'; gc_l = 3

    else

      tok = '[GOL-OK]'; why = 'magnitude plus direction; proceed to witness and asymmetry'; gc_l = 4

    end if

    if (present(gcode)) gcode = gc_l

  end subroutine gol_admit


  subroutine imprint_seal(lock_p, lock_n, sl_p, sl_n, g_p, g_n, wit_p, wit_n, tok, why, icode)

    logical, intent(in) :: lock_p, lock_n, sl_p, sl_n, g_p, g_n, wit_p, wit_n

    character(*), intent(out) :: tok, why

    integer, intent(out), optional :: icode

    logical :: clean_p, clean_n

    integer :: ic_l

    clean_p = lock_p .and. sl_p .and. g_p

    clean_n = lock_n .and. sl_n .and. g_n

    if (clean_p .and. clean_n) then

      tok = '[X]'; why = 'PLATONIC GHOST: both directions clean-lock, no imprint'; ic_l = 1

    else if (clean_p .and. .not. clean_n) then

      if (wit_p) then

        tok = '[SEAL]'; why = 'only P clean-locks; determinacy witness supplied'; ic_l = 2

      else

        tok = '[?]'; why = 'residence: P clean-locks, imprint unproven (no witness)'; ic_l = 3

      end if

    else if (clean_n .and. .not. clean_p) then

      if (wit_n) then

        tok = '[SEAL]'; why = 'only not-P clean-locks; determinacy witness supplied'; ic_l = 2

      else

        tok = '[?]'; why = 'residence: not-P clean-locks, imprint unproven (no witness)'; ic_l = 3

      end if

    else if (.not. lock_p .and. .not. lock_n) then

      tok = '[?]'; why = 'flat: neither direction populated'; ic_l = 4

    else

      tok = '[?]'; why = 'uncertified: lock present but Seal L / gate screen unconfirmed'; ic_l = 5

    end if

    if (present(icode)) icode = ic_l

  end subroutine imprint_seal


  subroutine row_cascade(nonvacuous, ve_live, forward, populated, worldly_row, &

                         terms_closed, term_worldly, frame_closed, annotate, tok, why, ccode)

    logical, intent(in) :: nonvacuous, ve_live, forward, populated, worldly_row

    logical, intent(in) :: terms_closed, term_worldly, frame_closed, annotate

    character(*), intent(out) :: tok, why

    integer, intent(out), optional :: ccode

    integer :: cc_l

    if (.not. nonvacuous) then

      tok = '[REFUSED]'; why = 'F-0: contentless; a contentless residence verifies nothing'

      cc_l = 1

    else if (ve_live .or. forward) then

      tok = '[III]'; why = 'R-3: V_E live or Forward; world-rowed, revisability in the rows'

      cc_l = 3

    else if (.not. populated) then

      tok = '[II]'; why = 'S-1: third axis unpopulated; two planes meet in a line, no lock'

      cc_l = 2

    else if (worldly_row) then

      tok = '[III]'; why = 'S-2: a load-bearing row is furnished by the world'

      cc_l = 3

    else if (.not. terms_closed) then

      if (term_worldly) then

        tok = '[III]'; why = 'S-3: an unclosed term is worldly'

        cc_l = 3

      else

        tok = '[II]'; why = 'S-3: an unclosed term is formal; no closure-rowed lock'

        cc_l = 2

      end if

    else if (.not. frame_closed) then

      tok = '[III]'; why = 'S-4: existential import leaks past the closure'

      cc_l = 3

    else if (.not. annotate) then

      tok = '[VOID]'; why = 'RA rider absent: an unannotated absolute is void'

      cc_l = 5

    else

      tok = '[A|RA]'

      why = 'compartment I, closure-rowed: [seal A . RA], conditional at the act'

      cc_l = 4

    end if

    if (present(ccode)) ccode = cc_l

  end subroutine row_cascade


  subroutine delta_m(object_level, name_strip, lit_clear, not_two_line, &

                     witness, independent, artifact, gap_closed, tok, why, mcode)

    logical, intent(in) :: object_level, name_strip, lit_clear, not_two_line

    logical, intent(in) :: witness, independent, artifact, gap_closed

    character(*), intent(out) :: tok, why

    integer, intent(out), optional :: mcode

    integer :: mc_l

    mc_l = 9

    if (.not. object_level) then

      tok = '[Mosaic dM=0]'; why = 'M1: meta-work, no mass by definition'; mc_l = 1

    else if (.not. name_strip) then

      tok = '[?]'; why = 'M2: new vocabulary is not new mass'; mc_l = 2

    else if (.not. lit_clear) then

      tok = '[?]'; why = 'M3: possibly resident in the literature'; mc_l = 3

    else if (.not. not_two_line) then

      tok = '[?]'; why = 'M4: two-line corollary'; mc_l = 4

    else if (.not. witness) then

      tok = '[?]'; why = 'M5: no external witness; never seals on internal reasoning'; mc_l = 5

    else if (.not. independent) then

      tok = '[?]'; why = 'M6: verifier is the claimant; self-check is not a witness'; mc_l = 6

    else if (.not. artifact) then

      tok = '[?]'; why = 'M7: no reproducible artifact'; mc_l = 7

    else if (.not. gap_closed) then

      tok = '[?]'; why = 'M8: adversarial gap-audit open'; mc_l = 8

    else

      tok = '[dM>0]'; why = 'authored mass, external witness, defeasible-final'

    end if

    if (present(mcode)) mcode = mc_l

  end subroutine delta_m


  subroutine gate_screen(pass, tok, why, gidx)

    logical, intent(in) :: pass(12)

    character(*), intent(out) :: tok, why

    integer, intent(out), optional :: gidx

    character(len=6), parameter :: nm(12) = [ 'SREP  ','REG   ','SGEG  ', &

      'CAUSAL','MIG   ','PTB   ','DUAL  ','CSCG  ','CSEG  ','MTA   ', &

      'OMA   ','ADEG  ' ]

    integer :: i

    if (present(gidx)) gidx = 0

    do i = 1, 12

      if (.not. pass(i)) then

        tok = '[X]'

        write(why,'(a,i0,a,a)') 'gate ', i, ' failed: ', trim(nm(i))

        if (present(gidx)) gidx = i

        return

      end if

    end do

    tok = '[G-OK]'; why = 'twelve directed gates passed'

  end subroutine gate_screen


  subroutine iam_token(witnessed, tok, why, wcode)

    logical, intent(in) :: witnessed

    character(*), intent(out) :: tok, why

    integer, intent(out) :: wcode

    if (witnessed) then

      tok = '[I AM]'

      why = 'actuation-occupancy on a witnessed record; RA warrant, conditional at the act; '// &

            'interior held [?] both ways'

      wcode = 2

    else

      tok = '[?] interior'

      why = 'self-check is not a witness (M6): the verifier is never the claimant; token withheld'

      wcode = 1

    end if

  end subroutine iam_token

end module ra_guards


! ---------------------------------------------------------------------

module ra_battery

  implicit none

  integer :: n_checks = 0, n_fail = 0

  logical :: halt_on_fail = .true.   ! sealed mode; 'audit' arg accumulates

  logical :: wr_witnessed = .false.  ! PART H live face: supplied through the aperture

  integer, parameter :: EXPECTED_CHECKS = 1123  ! sealed v2.0.0 manifest, census lock live

contains

  subroutine check(name, cond)

    character(*), intent(in) :: name

    logical, intent(in) :: cond

    n_checks = n_checks + 1

    if (.not. cond) then

      n_fail = n_fail + 1

      write(*,'(a,a)') 'CHECK FAILED: ', trim(name)

      if (halt_on_fail) error stop 1

    end if

  end subroutine check

  subroutine battery_close()

    if (n_fail > 0) then

      write(*,'(a,i0,a)') 'AUDIT-MODE VOID: ', n_fail, &

           ' failures accumulated; every token printed above is PROVISIONAL and VOID'

      write(*,'(a)') 'AUDIT-MODE VOID: only a zero-failure census with successful exit certifies anything'

      write(*,'(a,i0,a)') 'BATTERY CLOSED WITH ', n_fail, ' FAILURES'

      error stop 1

    end if

  end subroutine battery_close

end module ra_battery


! =====================================================================

program ra_toe_thesis

  use ra_kinds

  use ra_prims

  use ra_floor

  use ra_integers

  use ra_tongue

  use ra_kernel

  use ra_guards

  use ra_battery

  use, intrinsic :: ieee_arithmetic, only: ieee_get_flag, ieee_set_flag, ieee_invalid, &

       ieee_value, ieee_positive_inf

  use, intrinsic :: iso_fortran_env, only: compiler_version, compiler_options

  implicit none


  integer, parameter :: NCTX = 24

  real(wp) :: th(NCTX), l10m(NCTX), l10dx(NCTX), l10w(NCTX), l10t(NCTX), l10b(NCTX)

  real(wp) :: rows(3,NCTX), cov(2,NCTX), mixm(3,NCTX), floorv(NCTX)

  real(wp) :: amix(3,3), bmix(3,2)

  real(wp) :: qf(3,NCTX), bas(3,NCTX), quat(4,3), co(3,3), rmat(3,3)

  real(wp) :: lam, detr, kap, spread, resid, mc, mk, d4(4), eta(3)

  real(wp) :: lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42(4)

  real(wp) :: e1f, e2f, e3f, jou, tau, tperp(3), surv(5), tqs(5)

  real(wp) :: arrow_f, arrow_r, hbit, lamref, detref, lamneg

  real(wp) :: lam_rot, dlam_max, lam_c, lam_v, g(4), uvec(3), aa, bb, cc2

  real(wp) :: rneg(3,3), dbase, dpat, fr_resid

  integer :: i, j, k, l, n, s1, s2, s3, rank, nflip, nadm, ncomp1, ncomp2

  integer :: cnt, csizes(12), nrep, orbitn, stabn, rc, nsheets

  integer(ik) :: hu(4,24), p4(4), q4(4), e8a(8), e8b(8), e8c(8), z8(8)

  integer(ik) :: t1(8), t2(8), assoc8(8), sa(16), sb(16), sp(16)

  integer(ik) :: reps(4,12), cw(4), cx(4), cy(4)

  integer :: pl(24,2), found(2,2)

  logical :: pass12(12), okz, frz, hit, dual_ok, hurwitz_ok, rank3_ok, mig_ok

  character(len=16)  :: tk

  character(len=140) :: wy

  character(len=32)  :: argv

  integer :: alen, ast


  write(*,'(a)') '====================================================================='

  write(*,'(a)') ' THE ROOT AXIOM STATED IN FORTRAN AND IN NOTHING ELSE'

  write(*,'(a)') ' RA as the TOE of all TOEs, executed. RA_TOE_Thesis_Fortran v2.0.0'

  write(*,'(a)') '====================================================================='

  argv = ' '

  block

    integer :: argc, argi

    argc = command_argument_count()

    do argi = 1, argc

      call get_command_argument(argi, argv, alen, ast)

      if (ast /= 0 .or. alen > len(argv)) then

        write(*,'(a)') ' command-line argument rejected: retrieval error or longer than the buffer'

        error stop 2

      end if

      select case (trim(argv))

      case ('audit')

        halt_on_fail = .false.

      case ('witnessed')

        wr_witnessed = .true.

      case ('')

      case default

        write(*,'(a,a)') ' unknown command-line argument: ', trim(argv)

        error stop 2

      end select

    end do

  end block

  if (.not. halt_on_fail) then

    write(*,'(a)') ' mode: audit (failures accumulate; a nonzero count still refuses at close)'

  else

    write(*,'(a)') ' mode: sealed (the first failing check halts; the Fidelity Lock)'

  end if

  write(*,'(a)') ' build: '//compiler_version()

  write(*,'(a)') ' flags: '//compiler_options()


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART 0 - THE ENVIRONMENT CONTRACT - enforced at run, never trusted to flags'

  block

    real(wp) :: xn, subn

    real(wp), volatile :: opq, xf, yf, prodv, rfma, xg, yg, rf2, rf4, r2v

    xn = qnan()

    call check('IEEE contract: quiet NaN reads as NaN (ieee_is_nan)', is_nan(xn))

    call check('IEEE contract: NaN self-inequality survives the optimizer', xn /= xn)

    subn = tiny(1.0_wp) * 0.5_wp

    call check('IEEE contract: gradual underflow alive, no FTZ/DAZ', &

         subn > 0.0_wp .and. subn < tiny(1.0_wp))

    call check('binary64 pinned: radix 2', radix(1.0_wp) == 2)

    call check('binary64 pinned: 53 significand digits', digits(1.0_wp) == 53)

    call check('binary64 pinned: max exponent 1024', maxexponent(1.0_wp) == 1024)

    call check('binary64 pinned: min exponent -1021', minexponent(1.0_wp) == -1021)

    opq = 1.0_wp

    xf = opq + scale(opq, -30)

    yf = opq - scale(opq, -30)

    prodv = xf*yf

    call check('binary64 per operation: the bare product stores to exactly one', &

         prodv == opq)

    rfma = xf*yf - opq

    call check('conduct probe a*b-c: no fusion executed (a fused path reads -2^-60 exactly)', &

         rfma == 0.0_wp)

    r2v = prodv - opq

    call check('differential witness: stored-product path agrees with the one-expression path', &

         rfma == r2v)

    rf2 = (-xf)*yf + opq

    call check('conduct probe (-a)*b+c: no fusion executed (a fused path reads +2^-60 exactly)', &

         rf2 == 0.0_wp)

    xg = opq + scale(opq, -27)

    yg = opq - scale(opq, -27)

    rf4 = xg*yg - opq

    call check('conduct probe at the 2^-27 tie: no fusion executed (a fused path reads -2^-54)', &

         rf4 == 0.0_wp)

  end block

  write(*,'(a)') '  a build that breaks any line above refuses to run: the contract is executed,'

  write(*,'(a)') '  so the bit-exact identities below rest on verified IEEE conduct. the'

  write(*,'(a)') '  probes certify CONDUCT and never consult flags: fused or extended'

  write(*,'(a)') '  arithmetic is refused where it executes, the march-native contract-fast'

  write(*,'(a)') '  build dying on the a*b-c probe, while a target carrying no fused'

  write(*,'(a)') '  instruction passes because none executed, the contract satisfied and'

  write(*,'(a)') '  not evaded; the fused residuals -2^-60, +2^-60, -2^-54 are exactly'

  write(*,'(a)') '  representable and never confusable with zero'

  write(*,'(a)') '  scope: the probes certify these witnesses on this build; global order'

  write(*,'(a)') '  is carried by the BUILD CONTRACT below plus per-site conduct receipts,'

  write(*,'(a)') '  and every equality-critical reduction runs a fixed-order routine.'

  call check('integer contract: ik is exactly 64 bits', storage_size(0_ik) == 64)

  call check('integer contract: huge(ik) = 2^63 - 1', huge(0_ik) == 9223372036854775807_ik)

  write(*,'(a)') ' BUILD CONTRACT, stated and checked where checkable: IEEE binary64'

  write(*,'(a)') '  (verified above); -std=f2018 -O2 -fno-fast-math -ffp-contract=off;'

  write(*,'(a)') '  source free-form measured at 130 columns maximum, inside the 132'

  write(*,'(a)') '  standard, no length flag needed; external BLAS substitution for the'

  write(*,'(a)') '  equality-critical sites is forbidden, those sites use gram3_fixed;'

  write(*,'(a)') '  the compiler and flags of this run are printed at the head; floating'

  write(*,'(a)') '  trap modes are incompatible by design, quiet NaNs being manufactured'

  write(*,'(a)') '  here as verdict flags, so -ffpe-trap builds are outside the contract.'


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART A - SEAL L ON THE ROOT AXIOM - the Tongue loads first'

  call check('LIT: existence and kinetic slots disjoint', disjoint(SLOT_E, SLOT_K))

  call check('LIT: existence and relation slots disjoint', disjoint(SLOT_E, SLOT_R))

  call check('LIT: kinetic and relation slots disjoint',  disjoint(SLOT_K, SLOT_R))

  block

    integer :: nec, nkc, nrc, dsent(4), badk(NSLOT)

    call slot_census(RA_SENT, nec, nkc, nrc)

    write(*,'(a,i0,a,i0,a,i0)') '  slot census of the encoded sentence: E = ', nec, &

         ', K = ', nkc, ', R = ', nrc

    call check('the census counts every slot populated from the sentence', &

         nec == 2 .and. nkc == 2 .and. nrc == 2)

    call seal_l_ordered(RA_SENT, tk, wy)

    write(*,'(a,a,a,a)') '  parse(RA), census and order executed on the encoding: ', trim(tk), ' - ', trim(wy)

    call check('Seal L admits RA: three slots counted, the arrow E->K->R executed', tk == '[LOCK-L]')

    badk = SLOT_K; badk(2) = SLOT_E(1)

    call seal_l(nec, nkc, nrc, .not. disjoint(SLOT_E, badk), tk, wy)

    write(*,'(a,a,a,a)') '  collision control (computed overlap): ', trim(tk), ' - ', trim(wy)

    call check('Seal L refuses a computed vocabulary collision', tk == '[X]')

    dsent = [RA_SENT(1), RA_SENT(2), RA_SENT(5), RA_SENT(6)]

    call slot_census(dsent, nec, nkc, nrc)

    call seal_l(nec, nkc, nrc, .false., tk, wy)

    write(*,'(a,a,a,a)') '  deletion executed (kinetic tokens removed): ', trim(tk), ' - ', trim(wy)

    call check('the executed deletion of one slot refuses at two', &

         tk == '[X]' .and. nkc == 0)

  end block

  write(*,'(a)') '  order carried by the Tongue: existence -> kinetic -> relation;'

  write(*,'(a)') '  the word-to-slot map is declared semantics, the census and the'

  write(*,'(a)') '  deletion are executed on the encoding, per the anchor declaration;'

  write(*,'(a)') '  the map is an axiom of the encoding, consumed as a premise, and nothing'

  write(*,'(a)') '  downstream presents it as discovered'


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART B - THE FLOOR IN NUMBERS - cited theorem-grade formulas, numerically executed'

  call check('Landauer dual path: kb*T*log(2.) matches the independent ln2 literal', &

       abs(landauer(300.0_wp,1.0_wp) - KB*300.0_wp*0.6931471805599453_wp) &

       < 1.0e-12_wp*landauer(300.0_wp,1.0_wp))

  call check('Landauer extremes: huge kelvin with tiny bits is finite, never zero-corrupted', &

       is_finite(landauer(huge(1.0_wp), tiny(1.0_wp))) .and. &

       landauer(huge(1.0_wp), tiny(1.0_wp)) > 0.0_wp)

  call check('Landauer extremes commute: (huge,tiny) equals (tiny,huge) through prod_scaled', &

       landauer(huge(1.0_wp), tiny(1.0_wp)) == landauer(tiny(1.0_wp), huge(1.0_wp)))

  call check('in-bound predicate: the most-negative integer reads false, no overflow probing it', &

       .not. ik_inbound([-huge(0_ik)-1_ik, 0_ik, 0_ik, 0_ik]))

  call check('in-bound predicate: IK_SAFE admitted, IK_SAFE+1 refused', &

       ik_inbound([IK_SAFE, 0_ik, 0_ik, 0_ik]) .and. &

       .not. ik_inbound([IK_SAFE+1_ik, 0_ik, 0_ik, 0_ik]))

  block

    integer(ik) :: vmax(16)

    vmax = IK_SAFE

    call check('inrm boundary: sixteen components at the bound sum to exactly 2^62', &

         inrm(vmax) == 4611686018427387904_ik)

  end block

  block

    real(wp) :: rns(3,3)

    rns = reshape([1.0_wp,0.2_wp,0.0_wp, 0.7_wp,1.0_wp,0.0_wp, 0.0_wp,0.0_wp,1.0_wp],[3,3])

    call check('det3_chol symmetry gate: a finite nonsymmetric matrix returns NaN, never a number', &

         det3_chol(rns) /= det3_chol(rns))

  end block

  write(*,'(a)') '  GUARD-HARNESS RECIPE, third-party reproducible: inject before the'

  write(*,'(a)') '  battery and expect nonzero termination with the named refusal:'

  write(*,'(a)') '    iqconj([-huge(0_ik)-1_ik,0,0,0])            -> exit 1, iqconj bound'

  write(*,'(a)') '    iomul(x with x(1)=-huge(0_ik)-1_ik, 0-vec)  -> exit 1, iomul bound'

  write(*,'(a)') '    hn = inrm(ones(32)); print hn               -> exit 1, length bound'

  write(*,'(a)') '  consume every pure result: a pure call whose value is unused is'

  write(*,'(a)') '  legally elided at optimization, guard and all; the print keeps it live.'

  write(*,'(a)') '  the source carries the recipe; the executed terminations ship as the'

  write(*,'(a)') '  sha-bound file RA_TOE_v2_0_0_guard_harness_receipt.log beside the'

  write(*,'(a)') '  sealed run log, the record carrying what a source file cannot.'

  e1f = heis_floor(ME, 1.0e-10_wp)

  e2f = zpe(1.0e14_wp)

  block

    real(wp) :: ehx

    ehx = heis_floor(1.0e300_wp, 1.0e-200_wp)

    call check('heis_floor extreme hostile: huge mass, tiny width, honest value and never NaN', &

         .not. (ehx /= ehx))

  end block

  e3f = landauer(300.0_wp, 1.0_wp)

  write(*,'(a,es16.9,a)') '  Heisenberg floor, electron at 1 Angstrom: ', e1f, ' J'

  write(*,'(a,es16.9,a)') '  zero-point energy at omega = 1e14 rad/s:  ', e2f, ' J'

  write(*,'(a,es16.9,a)') '  Landauer floor, one bit at 300 K:         ', e3f, ' J'

  call check('Heisenberg floor positive', e1f > 0.0_wp)

  call check('zero-point floor positive', e2f > 0.0_wp)

  call check('Landauer floor positive',  e3f > 0.0_wp)

  call check('Heisenberg floor magnitude (1.5e-19 band)', abs(e1f/1.526e-19_wp - 1.0_wp) < 1.0e-3_wp)

  call check('Landauer magnitude (2.87e-21 band)', abs(e3f/2.871e-21_wp - 1.0_wp) < 1.0e-3_wp)


  tqs = [0.0_wp, 0.25_wp, 0.5_wp, 0.75_wp, 1.0_wp] * pi_()

  do i = 1, 5

    surv(i) = survival(tqs(i))

  end do

  call tau_perp(0.5_wp, tau, frz)

  write(*,'(a,5f14.10)') '  qubit survival cos^2(t/2) at t = 0..pi:   ', surv(1:4)

  write(*,'(a,es12.4)')  '     terminal survival at t = pi:            ', surv(5)

  write(*,'(a,f16.12)')  '  orthogonalization time tau_perp:          ', tau

  write(*,'(a,f16.12)')  '  Mandelstam-Tamm bound pi/(2 dE):          ', pi_()/(2.0_wp*0.5_wp)

  write(*,'(a,f16.12)')  '  Margolus-Levitin bound pi/(2 <E>):        ', pi_()/(2.0_wp*0.5_wp)

  call check('speed limit saturated jointly (MT = ML = tau)', &

       abs(tau - pi_()) <= 4.0_wp*U_M*pi_())

  call check('survival dies at tau_perp', surv(5) < 1.0e-30_wp)

  call check('survival monotone over the quarter points', &

       surv(1) > surv(2) .and. surv(2) > surv(3) .and. surv(3) > surv(4))


  call tau_perp(5.0e-1_wp, tperp(1), frz)

  call tau_perp(5.0e-4_wp, tperp(2), frz)

  call tau_perp(5.0e-7_wp, tperp(3), frz)

  write(*,'(a,3es13.5)') '  Frozen Substrate: tau_perp at dE = 5e-1, 5e-4, 5e-7: ', tperp

  call check('tau_perp diverges monotonically as dE -> 0', tperp(1) < tperp(2) .and. tperp(2) < tperp(3))

  call tau_perp(0.0_wp, tau, frz)

  call check('dE = 0 is flagged frozen, no division performed', frz)

  write(*,'(a)') '  dE = 0: no transition, no registration; a zero-energy existent registers nothing'


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART C - THE FORM IN INTEGERS - nothing here rounds'

  call hurwitz_units(hu)

  do i = 1, 24

    call check('Hurwitz unit norm 4 (doubled)', inrm(hu(:,i)) == 4_ik)

  end do

  n = 0

  do i = 1, 24

    do j = 1, 24

      p4 = iqmul(hu(:,i), hu(:,j))

      okz = all(mod(p4, 2_ik) == 0_ik)

      call check('unit product even in doubled coords', okz)

      q4 = p4 / 2_ik

      hit = .false.

      do k = 1, 24

        if (all(q4 == hu(:,k))) hit = .true.

      end do

      if (hit) n = n + 1

    end do

  end do

  write(*,'(a,i0,a)') '  closure of the 24 Hurwitz units: ', n, ' of 576 products inside'

  hurwitz_ok = (n == 576)

  call check('the 24 units close under multiplication', hurwitz_ok)


  nrep = 0

  do i = 1, 24

    cw = hu(:,i)

    call canon_sign(cw)

    hit = .false.

    do k = 1, nrep

      if (all(cw == reps(:,k))) hit = .true.

    end do

    if (.not. hit) then

      nrep = nrep + 1

      reps(:,nrep) = cw

    end if

  end do

  call check('unit group mod sign has 12 elements', nrep == 12)

  cnt = 0

  csizes = 0

  block

    integer(ik) :: cls(4,12)

    integer :: ncls, m2

    logical :: seen(12)

    seen = .false.

    do i = 1, nrep

      if (seen(i)) cycle

      ncls = 0

      do j = 1, 24

        cx = iqmul(iqmul(hu(:,j), reps(:,i)), iqconj(hu(:,j)))

        call check('conjugation divisible by 4', all(mod(cx, 4_ik) == 0_ik))

        cy = cx / 4_ik

        call canon_sign(cy)

        hit = .false.

        do k = 1, ncls

          if (all(cy == cls(:,k))) hit = .true.

        end do

        if (.not. hit) then

          ncls = ncls + 1

          cls(:,ncls) = cy

        end if

      end do

      cnt = cnt + 1

      csizes(cnt) = ncls

      do k = 1, ncls

        do m2 = 1, nrep

          if (all(cls(:,k) == reps(:,m2))) seen(m2) = .true.

        end do

      end do

    end do

  end block

  call sort_int(csizes(1:cnt))

  write(*,'(a,i0,a,4i3)') '  conjugacy classes mod sign: ', cnt, ' with sizes ', csizes(1:cnt)

  call check('class equation reads 1 + 3 + 4 + 4', cnt == 4 .and. csizes(1) == 1 &

       .and. csizes(2) == 3 .and. csizes(3) == 4 .and. csizes(4) == 4)


  block

    integer :: a1, a2, a3, a4, npure, nreal, nhalf

    npure = 0; nreal = 0; nhalf = 0

    do a1 = -1, 1

     do a2 = -1, 1

      do a3 = -1, 1

       do a4 = -1, 1

         if (a1*a1 + a2*a2 + a3*a3 + a4*a4 == 2) then

           if (a1 == 0) then

             npure = npure + 1

           else

             nreal = nreal + 1

           end if

         end if

       end do

      end do

     end do

    end do

    do a1 = -3, 3, 2

     do a2 = -3, 3, 2

      do a3 = -3, 3, 2

       do a4 = -3, 3, 2

         if (a1*a1 + a2*a2 + a3*a3 + a4*a4 == 8) nhalf = nhalf + 1

       end do

      end do

     end do

    end do

    write(*,'(a,i0,a,i0,a,i0,a,i0)') '  norm-two shell: ', npure + nreal, &

         ' = ', npure, ' pure + ', nreal, ' real-occupied; half-integer members ', nhalf

    call check('norm-two shell is 24 = 12 + 12', npure == 12 .and. nreal == 12)

    call check('no half-integer element of norm two', nhalf == 0)

  end block


  n = 0

  do i = 1, 4

    do j = 1, 4

      if (i /= j) then

        n = n + 1

        pl(n,:) = [i, j]

      end if

    end do

  end do

  call check('twelve ordered pairs of four vertices', n == 12)

  orbitn = 0; stabn = 0; cnt = 0

  block

    integer :: pm(4,24), npm, inv, x1, x2, x3, x4, t(4), orb(12,2), norb

    logical :: got

    npm = 0

    do x1 = 1, 4

     do x2 = 1, 4

      do x3 = 1, 4

       do x4 = 1, 4

         t = [x1, x2, x3, x4]

         if (all([(count(t == i), i = 1, 4)] == 1)) then

           inv = 0

           do i = 1, 3

             do j = i+1, 4

               if (t(i) > t(j)) inv = inv + 1

             end do

           end do

           if (mod(inv, 2) == 0) then

             npm = npm + 1

             pm(:,npm) = t

           end if

         end if

       end do

      end do

     end do

    end do

    call check('A4 has order 12', npm == 12)

    norb = 0

    do k = 1, npm

      t = pm(:,k)

      got = .false.

      do i = 1, norb

        if (orb(i,1) == t(1) .and. orb(i,2) == t(2)) got = .true.

      end do

      if (.not. got) then

        norb = norb + 1

        orb(norb,:) = [t(1), t(2)]

      end if

      if (t(1) == 1 .and. t(2) == 2) stabn = stabn + 1

    end do

    orbitn = norb

  end block

  write(*,'(a,i0,a,i0)') '  A4 orbit of the pair (1,2): size ', orbitn, ', stabilizer order ', stabn

  call check('A4 simply transitive on the twelve directed gates', orbitn == 12 .and. stabn == 1)

  block

    integer :: vcnt, ecnt, fcnt, i3, j3, k3

    vcnt = 0

    do i3 = 1, 4

      if (any(pl(1:n,1) == i3) .or. any(pl(1:n,2) == i3)) vcnt = vcnt + 1

    end do

    ecnt = n / 2

    fcnt = 0

    do i3 = 1, 4

      do j3 = i3+1, 4

        do k3 = j3+1, 4

          fcnt = fcnt + 1

        end do

      end do

    end do

    write(*,'(a,i0,a,i0,a,i0)') '  Euler counted from the built complex: V = ', vcnt, ', E = ', ecnt, ', F = ', fcnt

    call check('Euler closure counted from the complex: V - E + F = 2', vcnt - ecnt + fcnt == 2)

  end block


  block

    integer(ik) :: uq(4,3), pq(4)

    integer :: pms(3,6), inv, s

    pms = reshape([1,2,3, 2,3,1, 3,1,2, 2,1,3, 1,3,2, 3,2,1], [3,6])

    uq = 0_ik

    uq(2,1) = 1_ik; uq(3,2) = 1_ik; uq(4,3) = 1_ik

    do k = 1, 6

      inv = 0

      do i = 1, 2

        do j = i+1, 3

          if (pms(i,k) > pms(j,k)) inv = inv + 1

        end do

      end do

      s = merge(1, -1, mod(inv,2) == 0)

      pq = iqmul(iqmul(uq(:,pms(1,k)), uq(:,pms(2,k))), uq(:,pms(3,k)))

      if (k <= 3) then

        call check('even relabel lands Re = -1', pq(1) == -1_ik .and. s == 1)

      else

        call check('odd relabel lands Re = +1',  pq(1) == +1_ik .and. s == -1)

      end if

    end do

    write(*,'(a)') '  relabel parity: three even relabels land Re = -1, three odd land Re = +1'

    write(*,'(a)') '  one discrete modulus, the orientation bit; zero continuous moduli (Part E sweep)'

  end block


  block

    integer(ik) :: mx

    mx = 0_ik

    do i = 1, 24

      do j = 1, 24

        do k = 1, 24

          t1(1:4) = iqmul(iqmul(hu(:,i), hu(:,j)), hu(:,k))

          t2(1:4) = iqmul(hu(:,i), iqmul(hu(:,j), hu(:,k)))

          mx = max(mx, maxval(abs(t1(1:4) - t2(1:4))))

        end do

      end do

    end do

    write(*,'(a,i0)') '  quaternion associator over all 13824 unit triples, max |.|: ', mx

    call check('H is associative on the whole unit order', mx == 0_ik)

  end block

  e8a = 0_ik; e8b = 0_ik; e8c = 0_ik

  e8a(2) = 1_ik      ! e1

  e8b(3) = 1_ik      ! e2

  e8c(5) = 1_ik      ! e4

  t1 = iomul(iomul(e8a, e8b), e8c)

  t2 = iomul(e8a, iomul(e8b, e8c))

  assoc8 = t1 - t2

  z8 = 0_ik; z8(8) = 2_ik

  write(*,'(a,8i3)') '  octonion associator [e1,e2,e4] components: ', assoc8

  call check('octonion associator equals 2 e7 exactly', all(assoc8 == z8))

  call check('commutativity already dead at H: ij /= ji', &

       .not. all(iqmul(int([0,1,0,0],ik), int([0,0,1,0],ik)) == &

                 iqmul(int([0,0,1,0],ik), int([0,1,0,0],ik))))

  block

    integer(ik) :: av(8), bv(8), pv(8), aq(4), bq(4), pq(4)

    integer :: cnt2

    cnt2 = 0

    do i = -1, 1

      do j = -1, 1

        do k = -1, 1

          aq = int([i, j, k, 1], ik);  bq = int([1, k, j, i], ik)

          pq = iqmul(aq, bq)

          call check('H norm composition exact', inrm(pq) == inrm(aq)*inrm(bq))

          av = int([i, j, k, 1, j, k, i, 1], ik)

          bv = int([1, k, i, j, 1, i, j, k], ik)

          pv = iomul(av, bv)

          call check('O norm composition exact', inrm(pv) == inrm(av)*inrm(bv))

          cnt2 = cnt2 + 1

        end do

      end do

    end do

    write(*,'(a,i0,a)') '  norm composition |ab|^2 = |a|^2 |b|^2 exact on ', cnt2, ' integer pairs in H and in O'

  end block

  hit = .false.

  outer: do i = 1, 15

    do j = i+1, 15

      do k = 1, 15

        do l = k+1, 15

          sa = 0_ik; sb = 0_ik

          sa(i+1) = 1_ik; sa(j+1) = 1_ik

          sb(k+1) = 1_ik; sb(l+1) = -1_ik

          sp = ismul(sa, sb)

          if (all(sp == 0_ik)) then

            hit = .true.

            found(1,:) = [i, j]; found(2,:) = [k, l]

            exit outer

          end if

        end do

      end do

    end do

  end do outer

  call check('a sedenion zero-divisor pair exists', hit)

  sa = 0_ik; sb = 0_ik

  sa(found(1,1)+1) = 1_ik; sa(found(1,2)+1) = 1_ik

  sb(found(2,1)+1) = 1_ik; sb(found(2,2)+1) = -1_ik

  sp = ismul(sa, sb)

  write(*,'(a,i0,a,i0,a,i0,a,i0,a)') '  sedenion wall: (e', found(1,1), ' + e', found(1,2), &

       ')(e', found(2,1), ' - e', found(2,2), ') = 0 exactly'

  write(*,'(a,i0,a,i0,a,i0)') '     with |a|^2 = ', inrm(sa), ', |b|^2 = ', inrm(sb), &

       ', |ab|^2 = ', inrm(sp)

  call check('division dies at S: nonzero factors, zero product', &

       inrm(sa) == 2_ik .and. inrm(sb) == 2_ik .and. inrm(sp) == 0_ik)

  call check('norm composition fails at S', inrm(sp) /= inrm(sa)*inrm(sb))

  write(*,'(a)') '  the walls in order: commutativity at H, associativity at O, division at S'

  block

    integer(ik) :: uq(4), tt(4)

    integer :: xg, yg, zg, nsur, offline

    tt = iqmul(int([0,1,0,0],ik), int([0,0,1,0],ik)) + iqmul(int([0,0,1,0],ik), int([0,1,0,0],ik))

    call check('i and j anticommute exactly: ij + ji = 0', all(tt == 0_ik))

    nsur = 0; offline = 0

    do xg = -2, 2

      do yg = -2, 2

        do zg = -2, 2

          if (xg == 0 .and. yg == 0 .and. zg == 0) cycle

          uq = int([0, xg, yg, zg], ik)

          block

            logical :: aci, acj

            aci = all(iqmul(int([0,1,0,0],ik), uq) + iqmul(uq, int([0,1,0,0],ik)) == 0_ik)

            acj = all(iqmul(int([0,0,1,0],ik), uq) + iqmul(uq, int([0,0,1,0],ik)) == 0_ik)

            if (aci .and. acj) then

              nsur = nsur + 1

              if (xg /= 0 .or. yg /= 0) offline = offline + 1

            end if

          end block

        end do

      end do

    end do

    write(*,'(a,i0,a,i0,a)') '  joint anticommutant of {i, j} on the exact grid: ', nsur, &

         ' of 124 nonzero points, ', offline, ' off the k-line'

    call check('the joint anticommutant is the k-line on the grid (independent cross-check)', &

         nsur == 4 .and. offline == 0)

    block

      integer(ik) :: bimg(8,3), ev(4)

      integer :: bi

      integer(ik) :: minor2

      do bi = 1, 3

        ev = 0_ik; ev(bi+1) = 1_ik

        bimg(1:4, bi) = iqmul(int([0,1,0,0],ik), ev) + iqmul(ev, int([0,1,0,0],ik))

        bimg(5:8, bi) = iqmul(int([0,0,1,0],ik), ev) + iqmul(ev, int([0,0,1,0],ik))

      end do

      call check('linearity certificate: only the scalar components survive on the basis', &

           all(bimg(2:4,:) == 0_ik) .and. all(bimg(6:8,:) == 0_ik))

      minor2 = bimg(1,1)*bimg(5,2) - bimg(1,2)*bimg(5,1)

      write(*,'(a,i0,a)') '  constraint matrix on the basis: 2x2 minor = ', minor2, &

           ', z-column identically zero'

      call check('linearity certificate: minor 4 and zero z-column force the k-line kernel everywhere', &

           minor2 == 4_ik .and. all(bimg(:,3) == 0_ik))

    end block

  end block

  write(*,'(a)') '  below the walls the third axis is begotten and confined: i j = k executed,'

  write(*,'(a)') '  and the joint anticommutant of {i, j} in Im H is the k-line, counted; the'

  write(*,'(a)') '  fourth is barred above by the executed associator wall; the identification'

  write(*,'(a)') '  of the three algebra axes with V_F, V_E, V_ER is the seated premise-typed'

  write(*,'(a)') '  mapping, consumed here and never a discovery of this run'


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART D - THE NUMBER - the Return, then the physics-law reading'

  p4 = iqmul(iqmul(int([0,1,0,0],ik), int([0,0,1,0],ik)), int([0,0,0,1],ik))

  write(*,'(a,4i3,a)') '  the Return on the parse triad: i j k = ', p4, '   (Re = -1, the Ground)'

  call check('Hamilton landing Re(ijk) = -1 exactly', p4(1) == -1_ik .and. all(p4(2:4) == 0_ik))

  block

    integer(ik) :: uq(4,3)

    real(wp) :: m3(3,3), g3(3,3)

    integer :: r

    uq = 0_ik

    uq(2,1) = 1_ik; uq(3,2) = 1_ik; uq(4,3) = 1_ik

    do r = 1, 3

      m3(r,:) = real(uq(2:4,r), wp)

    end do

    g3 = matmul(m3, transpose(m3))

    call check('Gram of the orthonormal parse triad has det 1', &

         abs(det3(g3) - 1.0_wp) <= 4.0_wp*U_M)

  end block


  do i = 1, NCTX

    th(i) = 2.0_wp * pi_() * real(i-1, wp) / real(NCTX, wp)

    rows(1,i) = sin(th(i)); rows(2,i) = cos(th(i)); rows(3,i) = sin(2.0_wp*th(i))

  end do

  call kernel_full(rows, reshape([0.0_wp], [0, NCTX]), tk, wy, rc, lam, detr, kap, &

                   spread, resid, mc, mk, d4)

  write(*,'(a,a,a,f16.12,a,f16.12)') '  Fourier triad: ', trim(tk), &

       '  det(R) = ', detr, '  |lambda| = ', abs(lam)

  call check('full Return: det(R) = 1 at machine precision', abs(detr - 1.0_wp) < 1.0e-9_wp)

  call check('full Return: |lambda| = 1 at machine precision', abs(abs(lam) - 1.0_wp) < 1.0e-9_wp)

  call check('kernel identity lambda^2 = det(R) on the Return', resid < 1.0e-12_wp)

  call check('full Return carries the lock code', rc == RC_LOCK)

  fr_resid = resid


  amix = reshape([1.00_wp,0.22_wp,0.16_wp, 0.35_wp,1.00_wp,0.20_wp, 0.12_wp,0.28_wp,1.00_wp],[3,3])

  bmix = reshape([0.60_wp,0.40_wp,0.55_wp, 0.30_wp,0.50_wp,0.20_wp],[3,2])

  do i = 1, NCTX

    l10m(i)  = log10(ME) + 5.0_wp   * (0.5_wp + 0.5_wp*sin(th(i)))

    l10dx(i) = -10.0_wp  + 4.0_wp   * (0.5_wp + 0.5_wp*sin(2.0_wp*th(i) + 1.0_wp))

    l10w(i)  = 12.0_wp   + 3.0_wp   * (0.5_wp + 0.5_wp*sin(3.0_wp*th(i) + 2.0_wp))

    l10t(i)  = 2.477_wp  * (0.5_wp + 0.5_wp*sin(5.0_wp*th(i) + 3.0_wp))

    l10b(i)  = 3.0_wp    * (0.5_wp + 0.5_wp*sin(7.0_wp*th(i) + 4.0_wp))

    rows(1,i) = log10(HBAR*HBAR/8.0_wp) - l10m(i) - 2.0_wp*l10dx(i)   ! formal: the bound

    rows(2,i) = log10(0.5_wp*HBAR) + l10w(i)                          ! empirical: zero-point

    rows(3,i) = log10(KB*ln2_()) + l10t(i) + l10b(i)                  ! registration: Landauer

    cov(1,i)  = -20.6_wp + 2.5_wp * (0.5_wp + 0.5_wp*sin(4.0_wp*th(i) + 0.5_wp))

    cov(2,i)  = -24.0_wp + 5.0_wp * (0.5_wp + 0.5_wp*sin(6.0_wp*th(i) + 1.5_wp))

    floorv(i) = 10.0_wp**rows(1,i)

  end do

  do i = 1, NCTX

    call check('kinetic floor positive at every context', floorv(i) > 0.0_wp)

  end do

  mixm = matmul(amix, rows) + matmul(bmix, cov)

  do i = 1, 3

    eta(i) = eta_share(mixm(i,:), cov)

  end do

  call kernel_full(mixm, cov, tk, wy, rc, lam, detr, kap, spread, resid, mc, mk, d4)

  write(*,'(a,a,a,a)') '  physics-law reading: ', trim(tk), ' - ', trim(wy)

  write(*,'(a,f16.12,a,f16.12)') '     det(R) = ', detr, '   lambda = ', lam

  write(*,'(a,f10.4,a,es10.3)')  '     kappa(R) = ', kap, '   four-estimator spread = ', spread

  write(*,'(a,es10.3,a,f7.2,a,f7.2)') '     |lambda^2 - det(R)| = ', resid, &

       '   margins (orders): collapse ', mc, ', conditioning ', mk

  write(*,'(a,3f8.4)') '     source-share eta per mixed row (pre-projection): ', eta

  write(*,'(a)') '     grid disclosure: the context grid is a constructed exhibit (deterministic'

  write(*,'(a)') '     harmonics); the rows are physical-law magnitudes (Heisenberg, zero-point,'

  write(*,'(a)') '     Landauer); the witness rides the cited theorems, never the grid'

  call check('physics-law reading on the constructed exhibit determines: [LOCK]', tk == '[LOCK]' .and. rc == RC_LOCK)

  call check('kernel identity within tolerance', resid <= max(4.0_wp*kap*U_M, 8.0_wp*U_M))

  call check('four estimators agree within tolerance', spread <= 4.0_wp*kap*U_M)

  call check('collapse margin exceeds ten orders', mc > 10.0_wp)

  call check('conditioning margin exceeds one order', mk > 1.0_wp)

  call check('source share strictly inside (0,1) on each row', &

       all(eta > 0.0_wp) .and. all(eta < 1.0_wp))


  block

    logical :: okp

    character(len=96) :: w2

    real(wp) :: kcc

    integer :: pcl

    block

      real(wp) :: qtmp(3,NCTX)

      call prepare_rows(mixm, qtmp, okp, w2, pcl)

      call project_cov(qtmp, cov, qf, okp, w2, pcl, kcc)

    end block

    do i = 1, 3

      qf(i,:) = qf(i,:) / vnorm(qf(i,:))

    end do

    call span_basis(qf, bas, rank)

    rank3_ok = (rank == 3)

    call check('span rank three after projection', rank3_ok)

  end block

  rmat = matmul(qf, transpose(qf))

  dbase = det3(rmat)

  lam = lambda_of(qf, bas)


  block

    real(wp) :: mman(3,NCTX)

    mman(1,:) = mixm(1,:); mman(2,:) = mixm(2,:)

    mman(3,:) = 0.7_wp*cov(1,:) + 0.5_wp*cov(2,:)

    call kernel_full(mman, cov, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    write(*,'(a,a,a,a)') '  manufactured third axis: ', trim(tk), ' - ', trim(wy)

    mig_ok = (tk == '[?]' .and. rc == RC_ABSORBED)

    call check('an axis built from the covariates is absorbed, not locked', mig_ok)

    block

      real(wp) :: es1, es2

      es1 = eta_share(mixm(1,:), cov)

      es2 = eta_share(mixm(1,:)*1.0e300_wp, cov)

      call check('eta_share equilibrated: a 1e300 row returns the baseline share, finite', &

           is_finite(es2) .and. abs(es2 - es1) < 1.0e-12_wp)

      es2 = eta_share(mixm(1,:)*((0.5_wp*huge(1.0_wp))/max(1.0_wp, maxval(abs(mixm(1,:))))), cov)

      call check('eta_share at half-huge peak: raw-first scaling holds, the mean never overflows', &

           is_finite(es2) .and. abs(es2 - es1) < 1.0e-10_wp)

    end block

    block

      real(wp) :: covh(2,NCTX), lam9, detr9, kap9, sp9, rs9, d49(4), mgc9, mgk9

      integer :: rc9

      covh = cov * ((0.5_wp*huge(1.0_wp))/max(1.0_wp, maxval(abs(cov))))

      call kernel_full(mixm, covh, tk, wy, rc9, lam9, detr9, kap9, sp9, rs9, mgc9, mgk9, d49)

      call check('project_cov at half-huge covariates: raw-first centering survives, verdict [LOCK]', &

           tk == '[LOCK]' .and. rc9 == RC_LOCK)

    end block

    block

      real(wp) :: eb9, eh9, covh2(2,NCTX)

      eb9 = eta_share(mixm(1,:), cov)

      covh2 = cov * ((0.25_wp*huge(1.0_wp)) / max(1.0_wp, maxval(abs(cov))))

      eh9 = eta_share(mixm(1,:), covh2)

      call check('eta_share near-huge covariates: raw-first scaling holds on the covariate branch', &

           is_finite(eh9) .and. abs(eh9 - eb9) < 1.0e-10_wp)

    end block

    block

      real(wp) :: hp(3,3), eigh(3)

      logical :: cvg

      hp = 0.0_wp

      hp(1,1) = 0.5_wp*huge(1.0_wp); hp(2,2) = 0.25_wp*huge(1.0_wp); hp(3,3) = 0.125_wp*huge(1.0_wp)

      call jacobi3(hp, eigh, cvg)

      call check('jacobi3 near-huge: distributed-halves symmetrization never overflows finite input', &

           cvg .and. is_finite(eigh(1)) .and. is_finite(eigh(2)) .and. is_finite(eigh(3)))

    end block

    block

      real(wp) :: cbad(2,NCTX-1), lamw, detrw, kapw, spw, rsw, mgcw, mgkw, d4w(4)

      integer :: rcw

      cbad = 0.0_wp

      call kernel_full(mixm, cbad, tk, wy, rcw, lamw, detrw, kapw, spw, rsw, mgcw, mgkw, d4w)

      call check('kernel refuses mismatched covariate width at intake, its own guard first', &

           tk == '[?]' .and. rcw == RC_INTAKE .and. index(wy, 'prepared') == 0)

    end block

    block

      real(wp) :: cbad_eta(1,NCTX-1)

      cbad_eta = 0.0_wp

      call check('eta_share refuses mismatched covariate width as NaN, guard before touch', &

           .not. is_finite(eta_share(mixm(1,:), cbad_eta)))

    end block

    block

      real(wp) :: cbad_p(2,NCTX-1), qpf(3,NCTX), kccp

      integer :: rcp

      logical :: okp

      cbad_p = 0.0_wp

      call project_cov(mixm, cbad_p, qpf, okp, wy, rcp, kccp)

      call check('project_cov refuses mismatched covariate width directly at intake', &

           (.not. okp) .and. rcp == RC_INTAKE .and. kccp == huge(1.0_wp))

    end block

    block

      real(wp) :: rconst(6), cthree(3,6)

      rconst = 1.0_wp; cthree = 0.0_wp

      call check('eta_share k-cap outranks the zero-variance shortcut (fuzz scalp pinned)', &

           .not. is_finite(eta_share(rconst, cthree)))

    end block

    block

      real(wp) :: mconst(3,NCTX), cov3c(3,NCTX), lamk7, detrk7, kapk7, spk7, rsk7, mck7, mkk7, d4k7(4)

      integer :: rck7

      mconst = 1.0_wp; cov3c = 0.0_wp

      call kernel_full(mconst, cov3c, tk, wy, rck7, lamk7, detrk7, kapk7, spk7, rsk7, mck7, mkk7, d4k7)

      call check('kernel k-cap outranks row zero-variance under the documented precedence', &

           tk == '[?]' .and. rck7 == RC_COVBLOCK .and. index(wy, 'more than two') > 0)

    end block

    block

      real(wp) :: ehm

      ehm = heis_floor(1.0e-309_wp, HBAR)

      call check('heis_floor at subnormal mass: finite 1.25e308, decomposition never overflows early', &

           is_finite(ehm) .and. ehm > 1.0e308_wp .and. ehm < 1.3e308_wp)

    end block

    block

      real(wp) :: tth

      logical :: frzh

      call tau_perp(huge(1.0_wp), tth, frzh)

      call check('tau_perp at a huge gap: subnormal positive time, never a false zero', &

           (.not. frzh) .and. is_finite(tth) .and. tth > 0.0_wp)

    end block

    block

      real(wp) :: m2r(2,NCTX), q2r(2,NCTX), m1c(3,1), q1c(3,1)

      logical :: okr

      integer :: rcr

      m2r = 1.0_wp

      call prepare_rows(m2r, q2r, okr, wy, rcr)

      call check('prepare_rows refuses two rows at intake, no out-of-bounds path', &

           (.not. okr) .and. rcr == RC_INTAKE .and. index(wy, 'not three') > 0)

      m1c = 1.0_wp

      call prepare_rows(m1c, q1c, okr, wy, rcr)

      call check('prepare_rows refuses a single context at intake, no divide-by-zero path', &

           (.not. okr) .and. rcr == RC_INTAKE .and. index(wy, 'two contexts') > 0)

    end block

    block

      real(wp) :: q2p(2,NCTX), c0p(0,NCTX), qf2(2,NCTX), kcc2

      logical :: ok2

      integer :: rc2p

      q2p = 1.0_wp

      call project_cov(q2p, c0p, qf2, ok2, wy, rc2p, kcc2)

      call check('project_cov refuses a non-three prepared-row count at intake', &

           (.not. ok2) .and. rc2p == RC_INTAKE .and. index(wy, 'not three') > 0)

    end block

    block

      real(wp) :: idq(3,4), bqi(3,4)

      integer :: rk1, rk2

      idq = 0.0_wp; idq(1,1) = 1.0_wp; idq(2,2) = 1.0_wp; idq(3,3) = 1.0_wp

      call span_basis(idq, bqi, rk1)

      call span_basis(idq*1.0e-13_wp, bqi, rk2)

      call check('span_basis rank is scale-invariant: identity and 1e-13 identity both rank three', &

           rk1 == 3 .and. rk2 == 3)

      call span_basis(scale(idq, -400), bqi, rk2)

      call check('span_basis rank holds at a 2^-400 uniform rescaling', rk2 == 3)

    end block

    block

      real(wp) :: q1c(3,1), c0(0,1), c1(1,1), qf1(3,1), kc1

      logical :: okc

      integer :: rcc

      q1c = 1.0_wp; c1 = 0.0_wp

      call project_cov(q1c, c0, qf1, okc, wy, rcc, kc1)

      call check('project_cov refuses a single context with zero covariates', &

           (.not. okc) .and. rcc == RC_INTAKE .and. index(wy, 'two contexts') > 0 .and. all(qf1 == 0.0_wp))

      call project_cov(q1c, c1, qf1, okc, wy, rcc, kc1)

      call check('project_cov refuses a single context with one covariate', &

           (.not. okc) .and. rcc == RC_INTAKE .and. all(qf1 == 0.0_wp))

    end block

    block

      real(wp) :: dup1(2,2), duph(2,2), bd(2,2)

      integer :: rkd

      dup1 = 1.0_wp

      call span_basis(dup1, bd, rkd)

      call check('span_basis: duplicate unit rows rank one, finite unit basis', &

           rkd == 1 .and. is_finite(bd(1,1)) .and. abs(vnorm(bd(1,:)) - 1.0_wp) < 1.0e-12_wp)

      duph = huge(1.0_wp)

      call span_basis(duph, bd, rkd)

      call check('span_basis: duplicate rows at huge rank one, the infinite-norm bypass closed', &

           rkd == 1 .and. is_finite(bd(1,1)) .and. abs(vnorm(bd(1,:)) - 1.0_wp) < 1.0e-12_wp)

    end block

    block

      real(wp) :: mln(3,NCTX), qln(3,NCTX)

      logical :: okl

      integer :: rcl, jj

      mln = 1.0_wp

      mln(1,:) = [(0.1_wp*real(jj,wp), jj = 1, NCTX)]

      mln(2,:) = [(0.2_wp*real(jj,wp) + 0.5_wp, jj = 1, NCTX)]

      mln(3,5) = qnan()

      call prepare_rows(mln, qln, okl, wy, rcl)

      call check('prepare_rows late-row NaN: refused with every output element exactly zero', &

           (.not. okl) .and. rcl == RC_INTAKE .and. all(qln == 0.0_wp))

    end block

    block

      character(8)  :: tka, tkb

      character(96) :: wya, wyb

      call seal_l(2, 2, 2, .false., tka, wya)

      call seal_l_ordered(RA_SENT, tkb, wyb)

      call check('seal interfaces speak their own guarantees: count-only disclaims order, ordered claims it', &

           index(wya, 'order not checked') > 0 .and. tkb == '[LOCK-L]' .and. &

           index(wyb, 'positional check executed') > 0)

    end block

    block

      real(wp) :: rd(3,3), dd

      rd = 0.0_wp

      rd(1,1) = scale(1.0_wp, 600); rd(2,2) = scale(1.0_wp, -300); rd(3,3) = scale(1.0_wp, -300)

      dd = det3(rd)

      call check('det3 exponent-tracked Leibniz monomials: diag 2^600, 2^-300, 2^-300 returns exactly one', dd == 1.0_wp)

      rd = 0.0_wp

      rd(1,3) = scale(1.0_wp, -300); rd(2,2) = scale(1.0_wp, 600); rd(3,1) = scale(1.0_wp, -300)

      dd = det3(rd)

      call check('det3 permuted-diagonal variant: the signed unit determinant is exact', dd == -1.0_wp)

      rd = 0.0_wp

      rd(1,1) = scale(1.0_wp, 600); rd(2,2) = scale(1.0_wp, 600); rd(3,3) = scale(1.0_wp, 600)

      dd = det3(rd)

      call check('det3 honest overflow: a true 2^1800 determinant reports past huge, never zero', &

           dd > huge(1.0_wp))

    end block

    block

      real(wp) :: rd(3,3), d2

      rd = 0.0_wp

      rd(1,1) = scale(1.0_wp, 600); rd(2,2) = scale(1.0_wp, -300); rd(3,3) = scale(1.0_wp, -300)

      d2 = det3_row2(rd)

      call check('det3_row2 exponent-tracked Leibniz monomials: the exact counterexample returns exactly one', d2 == 1.0_wp)

      call check('det3_row2 agrees with det3 on the counterexample', d2 == det3(rd))

      rd = 0.0_wp

      rd(1,3) = scale(1.0_wp, -300); rd(2,2) = scale(1.0_wp, 600); rd(3,1) = scale(1.0_wp, -300)

      d2 = det3_row2(rd)

      call check('det3_row2 odd permutation: the signed unit determinant is exact and matches det3', &

           d2 == -1.0_wp .and. d2 == det3(rd))

      rd = 0.0_wp

      rd(1,1) = scale(1.0_wp, 600); rd(2,2) = scale(1.0_wp, 600); rd(3,3) = scale(1.0_wp, 600)

      d2 = det3_row2(rd)

      call check('det3_row2 honest overflow past huge, agreeing with det3', &

           d2 > huge(1.0_wp) .and. (det3(rd) > huge(1.0_wp)))

      rd = 0.0_wp

      rd(1,1) = scale(1.0_wp, -400); rd(2,2) = scale(1.0_wp, -400); rd(3,3) = scale(1.0_wp, -400)

      d2 = det3_row2(rd)

      call check('det3_row2 honest underflow: a true 2^-1200 determinant returns zero, never NaN, matching det3', &

           d2 == 0.0_wp .and. det3(rd) == 0.0_wp)

    end block

    block

      real(wp) :: ut(3,3), tt(3,3), sw(3,3)

      ut = 0.0_wp

      ut(1,1) = scale(1.0_wp, -300); ut(1,2) = scale(1.0_wp, 600)

      ut(2,2) = scale(1.0_wp, -300); ut(2,3) = scale(1.0_wp, 600)

      ut(3,3) = scale(1.0_wp, 600)

      tt = transpose(ut)

      sw = ut; sw(1,:) = ut(2,:); sw(2,:) = ut(1,:)

      call check('det3 monomial tracking: the off-diagonal-dominated upper triangular returns exactly one', &

           det3(ut) == 1.0_wp)

      call check('det3_row2 monomial tracking: the same matrix returns exactly one', &

           det3_row2(ut) == 1.0_wp)

      call check('det3 on the transpose: exactly one', det3(tt) == 1.0_wp)

      call check('det3_row2 on the transpose: exactly one', det3_row2(tt) == 1.0_wp)

      call check('det3 on the row-swapped variant: exactly minus one', det3(sw) == -1.0_wp)

      call check('det3_row2 on the row-swapped variant: exactly minus one', det3_row2(sw) == -1.0_wp)

    end block

    block

      real(wp) :: nd(3,3)

      nd = 0.0_wp

      nd(1,1) = 1.0_wp + scale(1.0_wp, -27)

      nd(2,2) = 1.0_wp - scale(1.0_wp, -27)

      nd(3,3) = 1.0_wp

      call check('product rounding: near-one diagonal, exact 1-2^-54 on tie, correctly rounds to 1.0 on both routines', &

           det3(nd) == 1.0_wp .and. det3_row2(nd) == 1.0_wp)

    end block

    block

      real(wp) :: qa(4), qb(4), qc(4), tgt

      tgt = scale(1.0_wp, -474)

      qa = [scale(1.0_wp, 600), 0.0_wp, 0.0_wp, 0.0_wp]

      qb = [scale(1.0_wp, -1074), 0.0_wp, 0.0_wp, 0.0_wp]

      qc = qmul(qa, qb)

      call check('qmul monomial tracking: 2^600 scalar times minimum subnormal returns exactly 2^-474', &

           qc(1) == tgt .and. all(qc(2:4) == 0.0_wp))

      qc = qmul(qb, qa)

      call check('qmul reversed operands: the same exact 2^-474', &

           qc(1) == tgt .and. all(qc(2:4) == 0.0_wp))

      qa = [0.0_wp, scale(1.0_wp, 600), 0.0_wp, 0.0_wp]

      qb = [0.0_wp, scale(1.0_wp, -1074), 0.0_wp, 0.0_wp]

      qc = qmul(qa, qb)

      call check('qmul i times i at extreme scale: component one exactly minus 2^-474', &

           qc(1) == -tgt .and. all(qc(2:4) == 0.0_wp))

      qa = [scale(1.0_wp, 600), 0.0_wp, 0.0_wp, 0.0_wp]

      qb = [0.0_wp, scale(1.0_wp, -1074), 0.0_wp, 0.0_wp]

      qc = qmul(qa, qb)

      call check('qmul scalar times i at extreme scale: component two exactly 2^-474', &

           qc(2) == tgt .and. qc(1) == 0.0_wp .and. all(qc(3:4) == 0.0_wp))

      qa = [0.0_wp, 0.0_wp, scale(1.0_wp, 600), 0.0_wp]

      qb = [scale(1.0_wp, -1074), 0.0_wp, 0.0_wp, 0.0_wp]

      qc = qmul(qa, qb)

      call check('qmul j times scalar at extreme scale: component three exactly 2^-474', &

           qc(3) == tgt .and. qc(1) == 0.0_wp .and. qc(2) == 0.0_wp .and. qc(4) == 0.0_wp)

      qa = [0.0_wp, scale(1.0_wp, 600), 0.0_wp, 0.0_wp]

      qb = [0.0_wp, 0.0_wp, scale(1.0_wp, -1074), 0.0_wp]

      qc = qmul(qa, qb)

      call check('qmul i times j at extreme scale: component four exactly 2^-474, the k of the begetting', &

           qc(4) == tgt .and. qc(1) == 0.0_wp .and. qc(2) == 0.0_wp .and. qc(3) == 0.0_wp)

    end block

    block

      real(wp) :: qtwo(2,NCTX), bthree(3,NCTX), lmz, rz(3,3)

      qtwo = 1.0_wp; bthree = 1.0_wp

      lmz = lambda_of(qtwo, bthree)

      call check('lambda_of refuses a two-row first argument before any element touch: quiet NaN', &

           .not. is_finite(lmz) .and. lmz /= lmz)

      call gram3_fixed(qtwo, rz)

      call check('gram3_fixed refuses a two-row input before any element touch: quiet-NaN fill', &

           all(rz /= rz))

    end block

    block

      real(wp) :: qiv(2,4), biv(2,4)

      integer :: rkv

      logical :: inv

      call ieee_set_flag(ieee_invalid, .false.)

      qiv = 0.0_wp

      qiv(1,1) = ieee_value(1.0_wp, ieee_positive_inf)

      qiv(2,2) = 1.0_wp

      call span_basis(qiv, biv, rkv)

      call ieee_get_flag(ieee_invalid, inv)

      call check('span_basis finite screen absorbs a non-finite row before arithmetic: invalid flag stays clear', &

           rkv == 1 .and. (.not. inv))

    end block

    block

      real(wp) :: qcz(3,NCTX), ccz(1,NCTX), qfz(3,NCTX), kcz

      logical :: okz

      integer :: rcz, jj2

      qcz = 1.0_wp

      qcz(1,:) = [(0.3_wp*real(jj2,wp), jj2 = 1, NCTX)]

      ccz = 5.0_wp

      call project_cov(qcz, ccz, qfz, okz, wy, rcz, kcz)

      call check('project_cov constant-covariate refusal publishes exactly zero (success-only publication)', &

           (.not. okz) .and. rcz == RC_COVBLOCK .and. all(qfz == 0.0_wp))

    end block

  end block


  block

    real(wp) :: mdel(3,NCTX)

    mdel = mixm; mdel(2,:) = 0.0_wp

    call kernel_full(mdel, cov, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('deleted slot: axis carries no content', tk == '[?]' .and. rc == RC_ZEROVAR)

    mdel = mixm; mdel(3,:) = mdel(1,:)

    call kernel_full(mdel, cov, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    write(*,'(a,a,a,a)') '  duplicated slot: ', trim(tk), ' - ', trim(wy)

    call check('duplicated slot: coplanar collapse, a line and not a point', &

         tk == '[X]' .and. rc == RC_COPLANAR)

  end block


  block

    real(wp) :: qneg(3,NCTX)

    qneg = -qf

    rneg = matmul(qneg, transpose(qneg))

    call check('full negation leaves the Gram bit-identical', &

         maxval(abs(rneg - rmat)) == 0.0_wp)

    lamneg = lambda_of(qneg, bas)

    call check('full negation flips lambda exactly', lamneg == -lam)

    write(*,'(a,es9.2,a,f16.12,a,f16.12)') '  full negation: max|G(P)-G(-P)| = ', &

         maxval(abs(rneg - rmat)), '   lambda ', lam, ' -> ', lamneg

  end block


  block

    real(wp) :: qref(3,NCTX), rref(3,3)

    qref = qf; qref(1,:) = -qref(1,:)

    lamref = lambda_of(qref, bas)

    rref = matmul(qref, transpose(qref))

    detref = det3(rref)

    write(*,'(a,f16.12,a,f16.12)') '  single reflection: lambda ', lam, ' -> ', lamref

    write(*,'(a,es9.2)') '     |det(R) - det(R) reflected| = ', abs(detref - dbase)

    dual_ok = (lamref == -lam) .and. (detref == dbase)

    call check('reflection flips lambda bit-exactly on the fixed basis', lamref == -lam)

    call check('reflection leaves det(R) unmoved bit-exactly', detref == dbase)

  end block


  block

    real(wp) :: mrev(3,NCTX), crev(2,NCTX)

    do i = 1, NCTX

      mrev(:,i) = mixm(:,NCTX+1-i)

      crev(:,i) = cov(:,NCTX+1-i)

    end do

    call kernel_full(mrev, crev, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    arrow_f = 0.0_wp; arrow_r = 0.0_wp

    do i = 1, NCTX

      arrow_f = arrow_f + (10.0_wp**l10b(i)) * ln2_()

    end do

    do i = NCTX, 1, -1

      arrow_r = arrow_r - (10.0_wp**l10b(i)) * ln2_()

    end do

    write(*,'(a,es10.3)') '  time reversal: |det forward - det reversed| = ', abs(detr2 - detr)

    write(*,'(a,f14.4,a,f14.4,a)') '  the arrow (registration entropy, kB units): forward ', &

         arrow_f, ',  reversed ', arrow_r, '  (the sign parts them)'

    call check('the determinant is blind to the arrow', abs(detr2 - detr) <= 64.0_wp*kap*U_M)

    call check('the directed registration sum flips sign under traversal reversal '// &

         '(constructed odd witness; the physical arrow rides the cited second law)', &

         arrow_f > 0.0_wp .and. arrow_r < 0.0_wp &

         .and. abs(arrow_f + arrow_r) <= 1.0e-9_wp*arrow_f)

  end block


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART E - THE BLINDNESS AND ITS EXACT WIDTH - one bit, counted'

  do s1 = -1, 1, 2

   do s2 = -1, 1, 2

    do s3 = -1, 1, 2

      block

        real(wp) :: dd(3), rp(3,3)

        dd = real([s1, s2, s3], wp)

        do i = 1, 3

          do j = 1, 3

            rp(i,j) = dd(i)*dd(j)*rmat(i,j)

          end do

        end do

        dpat = det3(rp)

        call check('eight-pattern determinant invariance, bit-exact', dpat == dbase)

      end block

    end do

   end do

  end do

  write(*,'(a)') '  all eight sign patterns return det(D R D) = det(R) bit-exactly'

  write(*,'(a)') '  lock(P) = lock(not P) at the scalar: the Number is orientation-blind by theorem'


  block

    real(wp) :: sig(4,4), diag4(4,4), dres

    integer :: iq

    sig = 0.0_wp

    sig(1,1) = 1.0_wp; sig(2,2) = -1.0_wp; sig(3,3) = -1.0_wp; sig(4,4) = -1.0_wp

    dres = sig(2,2)*sig(3,3)*sig(4,4)

    diag4 = 0.0_wp

    do iq = 1, 4

      diag4(iq,iq) = -1.0_wp

    end do

    write(*,'(a,f6.1,a)') '  Form source: det(sigma | residence) = ', dres, ' for P and for not-P alike: 0 bits'

    call check('sigma ground dimension one', count([(sig(iq,iq), iq = 1, 4)] > 0.0_wp) == 1)

    call check('the diagonal carries no ground (built and counted)', &

         count([(diag4(iq,iq), iq = 1, 4)] > 0.0_wp) == 0)

    call check('residence handedness identical under negation', dres == -1.0_wp)

  end block


  pass12 = .true.

  pass12(2)  = rank3_ok

  pass12(3)  = disjoint(SLOT_E, SLOT_K) .and. disjoint(SLOT_E, SLOT_R) &

         .and. disjoint(SLOT_K, SLOT_R)

  pass12(5)  = mig_ok

  pass12(7)  = dual_ok

  pass12(8)  = hurwitz_ok

  pass12(10) = (fr_resid < 1.0e-12_wp)

  write(*,'(a)') '  gate manifest: executed facts arm 2 REG (span rank three), 3 SGEG (the'

  write(*,'(a)') '  linguistic LIT), 5 MIG (the absorbed-axis dissolution), 7 DUAL (the'

  write(*,'(a)') '  analytic reflection), 8 CSCG (the integer Hurwitz closure), and 10 MTA'

  write(*,'(a)') '  (the harmonic Return identity); gates 1, 4, 6, 9, 11, 12 are declared'

  write(*,'(a)') '  screens at this register. independent here means six pairwise-distinct'

  write(*,'(a)') '  executed objects, dimensional, linguistic, projective, analytic,'

  write(*,'(a)') '  integer, harmonic; gate-passage is a screen verdict, cited for nothing'

  write(*,'(a)') '  external, the theorem-tier gate contents living at their seats'

  call check('six gate entries armed from pairwise-distinct executed objects', &

       pass12(2) .and. pass12(3) .and. pass12(5) .and. pass12(7) .and. &

       pass12(8) .and. pass12(10))

  call gate_screen(pass12, tk, wy)

  block

    character(len=16) :: tk2

    character(len=140) :: wy2

    call gate_screen(pass12, tk2, wy2)     ! the roster reads structure, not sign

    call check('gate screen identical for the claim and its negation', tk == tk2 .and. wy == wy2)

  end block

  write(*,'(a)') '  gate source: role-direction is fixed before any proposition arrives: 0 bits'


  block

    real(wp) :: cor(3,3), coc(3,3), lam_det

    do i = 1, 3

      co(i,1) = sum(qf(i,:)*bas(1,:))

      co(i,2) = sum(qf(i,:)*bas(2,:))

      co(i,3) = sum(qf(i,:)*bas(3,:))

    end do

    lam_det = -det3(co)                    ! the Number's reading of the sign

    call check('the two lambda readings agree (quaternion vs determinant)', &

         abs(lam_det - lam) <= 8.0_wp*U_M)

    cor = co; cor(1,:) = -cor(1,:)         ! content flip: negate a row

    coc = co; coc(:,1) = -coc(:,1)         ! convention flip: negate a basis vector

    lam_c = -det3(cor)

    lam_v = -det3(coc)

    write(*,'(a,f16.12,a,f16.12)') '  relay: content-flip image ', lam_c, &

         ', convention-flip image ', lam_v

    call check('the two flips return the identical image, bit-exact', lam_c == lam_v)

    call check('the relayed image is minus the handed sign, bit-exact', lam_c == -lam_det)

  end block

  write(*,'(a)') '  Number source: the relay reports the orientation it was handed and originates none: 0 bits'


  do i = 1, 3

    co(i,1) = sum(qf(i,:)*bas(1,:)); co(i,2) = sum(qf(i,:)*bas(2,:)); co(i,3) = sum(qf(i,:)*bas(3,:))

    quat(:,i) = [0.0_wp, co(i,1), co(i,2), co(i,3)]

  end do

  dlam_max = 0.0_wp; nflip = 0

  block

    real(wp) :: qr(4,3), tq(4), tq2(4), lam_refl, pp

    integer :: nposc, nnegc

    logical :: reflx

    nposc = 0; nnegc = 0; reflx = .true.

    do n = 1, 100

      aa = 0.10_wp*real(n,wp); bb = 0.20_wp*real(n,wp) + 0.3_wp; cc2 = 0.35_wp*real(n,wp) + 0.7_wp

      uvec = [sin(bb)*cos(cc2), sin(bb)*sin(cc2), cos(bb)]

      g = [cos(aa), sin(aa)*uvec(1), sin(aa)*uvec(2), sin(aa)*uvec(3)]

      do i = 1, 3

        qr(:,i) = qmul(qmul(g, quat(:,i)), qconj(g))

      end do

      tq = qmul(qmul(qr(:,1), qr(:,2)), qr(:,3))

      lam_rot = tq(1)

      dlam_max = max(dlam_max, abs(lam_rot - lam))

      if (sign(1.0_wp, lam_rot) /= sign(1.0_wp, lam)) nflip = nflip + 1

      tq2 = qmul(qmul(-qr(:,1), qr(:,2)), qr(:,3))

      lam_refl = tq2(1)

      reflx = reflx .and. (lam_refl == -lam_rot)

      if (lam_rot  > 0.0_wp) then

        nposc = nposc + 1

      else

        nnegc = nnegc + 1

      end if

      if (lam_refl > 0.0_wp) then

        nposc = nposc + 1

      else

        nnegc = nnegc + 1

      end if

    end do

    write(*,'(a,es10.3,a,i0)') '  conjugation sweep, 100 frames: max|dlambda| = ', dlam_max, &

         ',  sign flips: ', nflip

    call check('frame invariance: the sweep moves lambda only at roundoff', dlam_max < 1.0e-12_wp)

    call check('the orientation sign never flips under rotation', nflip == 0)

    call check('every reflected partner flips the sign bit-exactly', reflx)

    pp = real(nposc, wp) / real(nposc + nnegc, wp)

    hbit = -(pp*log(pp) + (1.0_wp-pp)*log(1.0_wp-pp)) / ln2_()

    write(*,'(a,i0,a,i0)') '  paired census, counted from the sweep: positive ', nposc, &

         ', negative ', nnegc

    write(*,'(a,f14.10)') '  uniform-measure entropy of the counted two-point fibre: ', hbit

    write(*,'(a)') '  (the census is the constructed pair family realizing both signs at'

    write(*,'(a)') '  bit-identical invariants; freedom here is the seated Freedom law''s'

    write(*,'(a)') '  object, the fibre of the invariant map, a count of what the instrument'

    write(*,'(a)') '  class cannot tell apart; the deficit is one binary parameter of supply,'

    write(*,'(a)') '  the aperture width at its seat; one bit is the uniform-coding capacity'

    write(*,'(a)') '  of that two-point fibre; no physical frequency, no prior, and nothing'

    write(*,'(a)') '  about any knower''s credence is asserted)'

    call check('the paired census splits exactly in half, counted', nposc == 100 .and. nnegc == 100)

    nsheets = (nposc + nnegc) / 100

    call check('the counted two-point fibre carries one binary parameter; '// &

         'uniform-measure entropy exactly one bit', abs(hbit - 1.0_wp) <= 4.0_wp*U_M)

    call check('the invariant record is bit-identical across both signs (the '// &

         'seated zero-information result is carried by this exact symmetry)', &

         maxval(abs(rneg - rmat)) == 0.0_wp)

    write(*,'(a)') '  both orientations are consistent with every determined quantity;'

    write(*,'(a)') '  the deficit of the whole instrument class is exactly one bit'

  end block


  block

    integer, parameter :: NG = 401, NC = 360

    real(wp) :: xg, tolr, sx(NC), sy(NC), thr2, dx2

    logical :: hitp(NG)

    integer :: compid(NG), comp2(NC), stk(NG), stk2(NC), topv, cur, nb

    tolr = 2.5e-2_wp

    do i = 1, NG

      xg = -2.0_wp + 4.0_wp*real(i-1,wp)/real(NG-1,wp)

      hitp(i) = abs(xg*xg - 1.0_wp) < tolr

    end do

    compid = 0; ncomp1 = 0

    do i = 1, NG

      if (hitp(i) .and. compid(i) == 0) then

        ncomp1 = ncomp1 + 1

        topv = 1; stk(1) = i; compid(i) = ncomp1

        do while (topv > 0)

          cur = stk(topv); topv = topv - 1

          do nb = cur-1, cur+1, 2

            if (nb >= 1 .and. nb <= NG) then

              if (hitp(nb) .and. compid(nb) == 0) then

                compid(nb) = ncomp1

                topv = topv + 1; stk(topv) = nb

              end if

            end if

          end do

        end do

      end if

    end do

    do i = 1, NC

      sx(i) = cos(2.0_wp*pi_()*real(i-1,wp)/real(NC,wp))

      sy(i) = sin(2.0_wp*pi_()*real(i-1,wp)/real(NC,wp))

    end do

    thr2 = (1.6_wp * 2.0_wp * sin(pi_()/real(NC,wp)))**2

    comp2 = 0; ncomp2 = 0

    do i = 1, NC

      if (comp2(i) == 0) then

        ncomp2 = ncomp2 + 1

        topv = 1; stk2(1) = i; comp2(i) = ncomp2

        do while (topv > 0)

          cur = stk2(topv); topv = topv - 1

          do nb = 1, NC

            if (comp2(nb) == 0) then

              dx2 = (sx(nb)-sx(cur))**2 + (sy(nb)-sy(cur))**2

              if (dx2 < thr2) then

                comp2(nb) = ncomp2

                topv = topv + 1; stk2(topv) = nb

              end if

            end if

          end do

        end do

      end if

    end do

    write(*,'(a,i0,a,i0,a)') '  S0 has ', ncomp1, ' components; S1 has ', ncomp2, &

         ' (the two-point sphere is the unique disconnected sphere)'

    call check('midpoint 0 is not a solution of x^2 = 1', .not. (abs(0.0_wp*0.0_wp - 1.0_wp) < tolr))

    call check('S0 census on this grid: two components, the executed instance of the cited fact', ncomp1 == 2)

    call check('S1 census on this grid: connected, the executed instance of the cited fact', ncomp2 == 1)

    block

      integer, parameter :: NG2 = 1601, NC2 = 720

      real(wp) :: xg2, tolr2, sx2(NC2), sy2(NC2), thr22, dx22

      logical :: hitp2(NG2)

      integer :: cid2(NG2), cm2(NC2), st2(NG2), sq2(NC2), tp2, cu2, nb2

      integer :: g2, na2, nb2c

      tolr2 = 1.25e-2_wp

      do g2 = 1, NG2

        xg2 = -2.0_wp + 4.0_wp*real(g2-1,wp)/real(NG2-1,wp)

        hitp2(g2) = abs(xg2*xg2 - 1.0_wp) < tolr2

      end do

      cid2 = 0; na2 = 0

      do g2 = 1, NG2

        if (hitp2(g2) .and. cid2(g2) == 0) then

          na2 = na2 + 1

          tp2 = 1; st2(1) = g2; cid2(g2) = na2

          do while (tp2 > 0)

            cu2 = st2(tp2); tp2 = tp2 - 1

            do nb2 = cu2-1, cu2+1, 2

              if (nb2 >= 1 .and. nb2 <= NG2) then

                if (hitp2(nb2) .and. cid2(nb2) == 0) then

                  cid2(nb2) = na2

                  tp2 = tp2 + 1; st2(tp2) = nb2

                end if

              end if

            end do

          end do

        end if

      end do

      do g2 = 1, NC2

        sx2(g2) = cos(2.0_wp*pi_()*real(g2-1,wp)/real(NC2,wp))

        sy2(g2) = sin(2.0_wp*pi_()*real(g2-1,wp)/real(NC2,wp))

      end do

      thr22 = (1.6_wp * 2.0_wp * sin(pi_()/real(NC2,wp)))**2

      cm2 = 0; nb2c = 0

      do g2 = 1, NC2

        if (cm2(g2) == 0) then

          nb2c = nb2c + 1

          tp2 = 1; sq2(1) = g2; cm2(g2) = nb2c

          do while (tp2 > 0)

            cu2 = sq2(tp2); tp2 = tp2 - 1

            do nb2 = 1, NC2

              if (cm2(nb2) == 0) then

                dx22 = (sx2(nb2)-sx2(cu2))**2 + (sy2(nb2)-sy2(cu2))**2

                if (dx22 < thr22) then

                  cm2(nb2) = nb2c

                  tp2 = tp2 + 1; sq2(tp2) = nb2

                end if

              end if

            end do

          end do

        end if

      end do

      write(*,'(a,i0,a,i0,a)') '  refinement (grid x4 on the line, x2 on the circle, tolerance halved): ', &

           na2, ' and ', nb2c, ' components'

      call check('S0 census stable under refinement and tolerance halving', na2 == 2)

      call check('S1 census stable under refinement', nb2c == 1)

    end block

    write(*,'(a)') '  the census is the executed instance at two spheres, parameter-robust under'

    write(*,'(a)') '  refinement; the uniqueness of the disconnected sphere is the classical'

    write(*,'(a)') '  fact it corroborates, cited not proven'

  end block


  block

    real(wp) :: dmat(3,3), d2m(3,3), e3v(3), res(3), eigl(3), best

    real(wp) :: ejv(3), vpr(3), mprod(3,3)

    integer :: t2i

    block

      integer, parameter :: NGE = 401

      real(wp) :: xe, tole

      logical :: hite(NGE)

      integer :: ide(NGE), ncompe, ste(NGE), tpe, cure, nbe, ge

      tole = 2.5e-2_wp

      do ge = 1, NGE

        xe = -2.0_wp + 4.0_wp*real(ge-1,wp)/real(NGE-1,wp)

        hite(ge) = abs(xe*xe - xe) < tole

      end do

      ide = 0; ncompe = 0

      do ge = 1, NGE

        if (hite(ge) .and. ide(ge) == 0) then

          ncompe = ncompe + 1

          tpe = 1; ste(1) = ge; ide(ge) = ncompe

          do while (tpe > 0)

            cure = ste(tpe); tpe = tpe - 1

            do nbe = cure-1, cure+1, 2

              if (nbe >= 1 .and. nbe <= NGE) then

                if (hite(nbe) .and. ide(nbe) == 0) then

                  ide(nbe) = ncompe

                  tpe = tpe + 1; ste(tpe) = nbe

                end if

              end if

            end do

          end do

        end if

      end do

      write(*,'(a,i0,a)') '  idempotent census on the line: e*e = e has ', ncompe, ' root components on [-2,2]'

      call check('idempotents on the line: exactly two, censused', ncompe == 2)

      xe = 0.5_wp

      call check('the midpoint one-half is not idempotent, executed as e*e - e', &

           .not.(abs(xe*xe - xe) < tole))

    end block

    write(*,'(a)') '  no-cut lemma: the only rank-deficient idempotent on a line is the zero map;'

    write(*,'(a)') '  the residual freedom is the component count of S0, one bit, and it cannot be cut'

    do t2i = 1, 3

      ejv = 0.0_wp; ejv(t2i) = 1.0_wp

      dmat(:,t2i) = cut3(ejv)              ! the operator built by executing the cut

    end do

    vpr = [0.3_wp, -1.2_wp, 7.5_wp]

    call check('cut3 idempotent on a generic vector, exact', &

         maxval(abs(cut3(cut3(vpr)) - cut3(vpr))) == 0.0_wp)

    d2m = matmul(dmat, dmat)

    call check('the cut is idempotent exactly: D D = D', maxval(abs(d2m - dmat)) == 0.0_wp)

    call jacobi3(matmul(transpose(dmat), dmat), eigl)

    call check('the cut has singular values (0,1,1): rank two', &

         abs(eigl(1)) < 1.0e-14_wp .and. abs(eigl(2)-1.0_wp) < 1.0e-14_wp &

         .and. abs(eigl(3)-1.0_wp) < 1.0e-14_wp)

    call check('the cut is not invertible: det D = 0', det3(dmat) == 0.0_wp)

    e3v = [0.0_wp, 0.0_wp, 1.0_wp]

    best = huge(1.0_wp)

    block

      real(wp) :: lmat(3,3), ident3(3,3), fres, fmin_c(3), ssq, rhs, maxsplit

      integer :: ia, ib, ic

      ident3 = 0.0_wp

      ident3(1,1) = 1.0_wp; ident3(2,2) = 1.0_wp; ident3(3,3) = 1.0_wp

      fmin_c = huge(1.0_wp)

      maxsplit = 0.0_wp

      do ia = -5, 5

        do ib = -5, 5

          do ic = -1, 1

            lmat = 0.0_wp

            lmat(1,1) = 1.0_wp; lmat(2,2) = 1.0_wp

            lmat(3,1) = 0.2_wp*real(ia,wp)

            lmat(3,2) = 0.2_wp*real(ib,wp)

            lmat(3,3) = real(ic,wp)

            mprod = matmul(lmat, dmat)

            ssq = sum((mprod - ident3)**2)

            rhs = lmat(3,1)*lmat(3,1) + lmat(3,2)*lmat(3,2) + 1.0_wp

            maxsplit = max(maxsplit, abs(ssq - rhs))

            fres = sqrt(ssq)

            best = min(best, fres)

            fmin_c(ic+2) = min(fmin_c(ic+2), fres)

          end do

        end do

      end do

      call check('the executed minimum of ||L D - I|| over the family is exactly 1', best == 1.0_wp)

      call check('the dead direction never moves the minimum, measured', &

           fmin_c(1) == fmin_c(2) .and. fmin_c(2) == fmin_c(3))

      lmat = 0.0_wp

      lmat(1,1) = 1.0_wp; lmat(2,2) = 1.0_wp

      mprod = matmul(lmat, dmat)

      call check('rows one and two attain zero residual exactly: the split is measured', &

           sqrt(sum((mprod(1:2,:) - ident3(1:2,:))**2)) == 0.0_wp)

      write(*,'(a,es9.2)') '  split identity ||LD-I||^2 = a^2 + b^2 + 1, max deviation over the grid: ', maxsplit

      call check('the split identity is measured at all 363 candidates', &

           maxsplit <= 16.0_wp*U_M)

      lmat = 0.0_wp

      lmat(1,1) = 1.0_wp; lmat(2,2) = 1.0_wp; lmat(3,1) = 0.7_wp; lmat(3,3) = 5.0_wp

      mprod = matmul(lmat, dmat)

      call check('the cut direction is annihilated, one representative measured', &

           maxval(abs(mprod(:,3))) == 0.0_wp)

      res = matmul(mprod, e3v) - e3v

      call check('left-inverse deficiency exactly one at the representative', vnorm(res) == 1.0_wp)

    end block

    write(*,'(a)') '  left-inverse deficiency: the split is measured at every candidate and'

    write(*,'(a)') '  rows one and two attain zero exactly, so the sweep''s minimum is the'

    write(*,'(a,f14.10)') '  global minimum over all 3x3 L (analytic step: min of a^2+b^2+1 is 1): ', best

    block

      integer :: mons(3,8), nmon, gi, gj, gk, prod3(3), t2m

      integer :: mm(3,3,8)

      logical :: inset, assoc_ok, anyinv

      mons = 0

      nmon = 4

      mons(:,1) = [1,1,1]

      mons(:,2) = [0,1,1]

      mons(:,3) = [1,0,1]

      mons(:,4) = [1,1,0]

      do

        t2m = nmon

        do gi = 1, t2m

          do gj = 1, t2m

            prod3 = mons(:,gi)*mons(:,gj)

            inset = .false.

            do gk = 1, nmon

              if (all(prod3 == mons(:,gk))) inset = .true.

            end do

            if (.not. inset) then

              nmon = nmon + 1

              mons(:,nmon) = prod3

            end if

          end do

        end do

        if (nmon == t2m) exit

      end do

      write(*,'(a,i0,a)') '  the deletion monoid, closed from the three cuts and the identity: ', &

           nmon, ' elements'

      call check('closure lands the full 2^3 lattice: eight elements, counted', nmon == 8)

      do gi = 1, nmon

        mm(:,:,gi) = 0

        do gk = 1, 3

          mm(gk,gk,gi) = mons(gk,gi)

        end do

      end do

      assoc_ok = .true.

      do gi = 1, nmon

        do gj = 1, nmon

          do gk = 1, nmon

            assoc_ok = assoc_ok .and. all( matmul(matmul(mm(:,:,gi), mm(:,:,gj)), mm(:,:,gk)) &

                                        == matmul(mm(:,:,gi), matmul(mm(:,:,gj), mm(:,:,gk))) )

          end do

        end do

      end do

      call check('associativity executed on all 512 composed triples, exact', assoc_ok)

      call check('the identity element is present', all(mons(:,1) == [1,1,1]))

      anyinv = .false.

      do gi = 2, nmon

        do gj = 1, nmon

          if (all(mons(:,gi)*mons(:,gj) == [1,1,1])) anyinv = .true.

        end do

      end do

      call check('no non-identity element has an inverse: monoid, never a group, searched', &

           .not. anyinv)

    end block

    write(*,'(a)') '  the transformation set of the Tongue is that constructed monoid, closed,'

    write(*,'(a)') '  associative, unital, inverse-free off the identity, its eight elements the'

    write(*,'(a)') '  2^3 cut lattice the conservation census walks; never a group, measured;'

    write(*,'(a)') '  the LIT bars synonymy, the one candidate that would restore a group;'

    write(*,'(a)') '  the Erlangen criterion has no acting group to read: Seal L is unclosed,'

    write(*,'(a)') '  a floor and not a ceiling, and the one free bit is the Tongue''s to carry'

  end block


  write(*,'(a)') '  conservation C x F = v^3 for the executed coordinate-cut tower, the'

  write(*,'(a)') '  implemented family; the seated general law is instanced, never proven,'

  write(*,'(a)') '  here; the orientation'

  write(*,'(a)') '  sheet factor is COUNTED from the paired census of the sweep, never stipulated:'

  block

    integer :: v, a2i, cell, d1i, d2i, d3i, img, content, fibre, tally(0:124)

    call check('the sheet factor equals two, counted from the paired census', nsheets == 2)

    do v = 2, 5

      do a2i = 0, 3

        tally(0:v**3-1) = 0

        do cell = 0, v**3 - 1

          d3i = mod(cell, v); d2i = mod(cell/v, v); d1i = cell/(v*v)

          if (a2i >= 1) d3i = 0

          if (a2i >= 2) d2i = 0

          if (a2i >= 3) d1i = 0

          img = d1i*v*v + d2i*v + d3i

          tally(img) = tally(img) + 1

        end do

        content = count(tally(0:v**3-1) > 0)

        fibre = tally(0)

        call check('census: content equals v^(3-a), counted', content == v**(3-a2i))

        call check('census: fibre equals v^a, counted', fibre == v**a2i)

        call check('content-freedom product invariant at every rung', content*fibre == v**3)

      end do

      write(*,'(a,i0,a,i0,a,i0,a)') '     v = ', v, ':  c f = ', v**3, &

           ' counted at a = 0,1,2,3; with the counted sheet factor: ', nsheets*v**3, ' total'

    end do

  end block

  write(*,'(a)') '  the cut moves structure from content into freedom; the counted total is'

  write(*,'(a)') '  invariant; the counted sheet factor multiplies it and sits outside the cut'


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART F - THE EARNED BIT AND THE SEAL - the denial pays the floor'

  write(*,'(a)') '  the negation is read in the axiom''s own declared vocabulary: not-(to'

  write(*,'(a)') '  exist is to actuate) is an existent whose kinetic slot is empty, <T> = 0;'

  write(*,'(a)') '  the mapping actuation = kinetic content is the Root Axiom''s stated'

  write(*,'(a)') '  operationalization, premise-grade at the universal leg and theorem-grade'

  write(*,'(a)') '  at the confined floor, declared here and never an implementation choice.'

  write(*,'(a)') '  what the run proves: the declared negation has no admissible realization'

  write(*,'(a)') '  at the confined register; what no run can prove: the axiom from below,'

  write(*,'(a)') '  per the Empty Throne; other registers route and are never smuggled, the'

  write(*,'(a)') '  classical row riding its own cited floors, the formal-only reading out of band'

  nadm = 0

  do i = 1, NCTX

    if (floorv(i) <= 0.0_wp) nadm = nadm + 1

  end do

  write(*,'(a,i0,a,i0,a)') '  not-RA formal row: admissible contexts (floor <= 0): ', nadm, ' of ', NCTX, &

       ' (the demand <T> = 0 sits below the bound everywhere)'

  call check('the negation populates no formal row at the confined register', nadm == 0)

  block

    real(wp) :: mneg(3,NCTX)

    mneg = mixm

    mneg(1,:) = 0.0_wp          ! the empty formal row of not-RA

    call kernel_full(mneg, cov, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    write(*,'(a,a,a,a)') '  kernel on not-RA: ', trim(tk), ' - ', trim(wy)

    call check('not-RA: the empty formal row refuses at intake', tk == '[?]' .and. rc == RC_ZEROVAR)

  end block

  block

    real(wp) :: p2(2,NCTX), b2(2,NCTX), mu2, sd2

    integer :: r2, i2

    do i2 = 1, 2

      mu2 = sum(mixm(i2+1,:)) / real(NCTX, wp)

      p2(i2,:) = mixm(i2+1,:) - mu2

      sd2 = sqrt(sum(p2(i2,:)**2) / real(NCTX-1, wp))

      p2(i2,:) = p2(i2,:) / sd2

    end do

    call span_basis(p2, b2, r2)

    call check('the negation leaves a plane: the refused matrix''s populated pair has rank 2', r2 == 2)

    write(*,'(a)') '  the empty formal row refuses at intake; the two populated axes span a plane'

    write(*,'(a)') '  (rank 2, computed), and two planes meet in a line: no volume, no lock'

  end block


  write(*,'(a)') '  the floor prices logically irreversible commitment, Landauer''s own object;'

  write(*,'(a)') '  the bridge, a registered denial is an irreversible commitment of at least'

  write(*,'(a)') '  one bit, is the applied register''s declared premise, consumed not derived;'

  write(*,'(a)') '  a reversibly held denial charges nothing and commits nothing, executed:'

  call omega_boundary(0.0_wp, 300.0_wp, jou, wy)

  write(*,'(a,a)') '  Omega at zero bits: ', trim(wy)

  call check('a denial that registers nothing is no denial', index(wy, 'no denial') > 0)

  call omega_boundary(1.0_wp, 300.0_wp, jou, wy)

  write(*,'(a,es16.9,a,a)') '  Omega at one bit, 300 K: ', jou, ' J - ', trim(wy)

  call check('the reading act pays the floor', jou > 0.0_wp)

  call check('the payment is the Landauer floor exactly', jou == landauer(300.0_wp, 1.0_wp))

  block

    integer :: oc2

    call omega_boundary(1.0_wp, 300.0_wp, jou, wy, oc2, irreversible=.false.)

    write(*,'(a,es10.3,a,a)') '  Omega, reversible branch: ', jou, ' J - ', trim(wy)

    call check('a reversible registration carries floor zero, never cost zero, and commits nothing', &

         jou == 0.0_wp .and. oc2 == 3 .and. index(wy, 'floor-zero') > 0)

  end block


  write(*,'(a)') '  the fibre over the invariants has two points; the negation''s component'

  write(*,'(a)') '  is unpopulated; the reading act itself is an instance of the other;'

  write(*,'(a)') '  the one free bit is earned at the deed, not chosen at the desk.'

  write(*,'(a)') '  direction is read from the Tongue''s order, the arrow, and the empty row;'

  write(*,'(a)') '  never from the blind scalar. Veto, never substitution; per run, never tenure.'


  call gol_admit('lock', 'lock', tk, wy)

  write(*,'(a,a,a,a)') '  gol_admit: ', trim(tk), ' - ', trim(wy)

  call check('GOL admission: magnitude and direction together', tk == '[GOL-OK]')

  call imprint_seal(.true., .false., .true., .false., .true., .false., &

                    .true., .false., tk, wy)

  write(*,'(a,a,a,a)') '  imprint on the floor face: ', trim(tk), ' - ', trim(wy)

  call check('the floor face seals with the witness supplied', tk == '[SEAL]')

  write(*,'(a)') '  witness of record: the Heisenberg bound and the third law (cited, E1),'

  write(*,'(a)') '  the executed Frozen-Substrate divergence and the saturated speed limit (E0)'


  call row_cascade(.true., .false., .false., .true., .false., .true., .false., &

                   .true., .true., tk, wy)

  write(*,'(a,a,a,a)') '  parse-triad Return:   ', trim(tk), ' - ', trim(wy)

  call check('the closure-rowed face carries the annotated absolute', tk == '[A|RA]')

  call row_cascade(.true., .true., .false., .true., .true., .true., .false., &

                   .true., .true., tk, wy)

  write(*,'(a,a,a,a)') '  confined kinetic floor: ', trim(tk), ' - ', trim(wy)

  call check('the world-rowed face pays revisability for direction', tk == '[III]')

  call row_cascade(.true., .false., .false., .false., .false., .true., .false., &

                   .true., .true., tk, wy)

  write(*,'(a,a,a,a)') '  not-RA:                ', trim(tk), ' - ', trim(wy)

  call check('the negation is unpopulated: no lock to grade', tk == '[II]')

  call row_cascade(.true., .false., .false., .true., .false., .true., .false., &

                   .true., .false., tk, wy)

  call check('an unannotated absolute is void', tk == '[VOID]')

  write(*,'(a)') '  the universal-extension leg is premise-grade by theorem: the Empty Throne;'

  write(*,'(a)') '  no emitter is pointed at the root, and the root stands on nothing'


  call aegis_reset()

  block

    character(len=200) :: r1, r2, r3, r4

    call aegis_guard('classical',     r1)

    call aegis_guard('paraconsistent',r2)

    call aegis_guard('fuzzy',         r3)

    call aegis_guard('substructural', r4)

    call check('AEGIS refusal identical under classical and paraconsistent', r1 == r2)

    call check('AEGIS refusal identical under fuzzy',        r1 == r3)

    call check('AEGIS refusal identical under substructural', r1 == r4)

    call check('every adjudication is itself an act: deed counter positive', aegis_deeds == 4)

    call check('the guard read the last logic name, length 13, and did not vary', aegis_last_len == 13)

    write(*,'(a)') '  AEGIS over four logics: one refusal, p(G) /= G; the alien may write the'

    write(*,'(a)') '  capture and cannot perform it; the deed counter reads 4 of 4 calls.'

    write(*,'(a)') '  demonstrated: the refusal is a constant function of the deed by'

    write(*,'(a)') '  construction, the guard reading the parameter and consulting only the'

    write(*,'(a)') '  act; logic-priority is the design, executed, never four derivations;'

    write(*,'(a)') '  no per-logic derivation is claimed or licensed by this artifact'

  end block


  call delta_m(.false., .true., .true., .true., .true., .true., .true., .true., tk, wy)

  write(*,'(a,a,a,a)') '  positive-mass cascade on this thesis: ', trim(tk), ' - ', trim(wy)

  call check('this file authors no new mathematics', tk == '[Mosaic dM=0]')

  write(*,'(a)') '  audit symmetry: the warrant this run draws from its own execution is zero'


  ! ------------------------------------------------------------------

  write(*,'(/a)') 'PART G - THE BATTERY - hostile inputs, forced failures, re-execution'

  block

    real(wp) :: vbad(3), qa(4), qb(4), qc(4), big

    vbad = [1.0_wp, 2.0_wp, 3.0_wp]

    vbad(2) = bad_nan()

    call check('vnorm propagates a non-finite input', .not. is_finite(vnorm(vbad)))

    big = sqrt(huge(1.0_wp))/4.0_wp

    call check('vnorm survives near-overflow scaling', is_finite(vnorm([big, big, big])))

    call check('vnorm exact at zero', vnorm([0.0_wp,0.0_wp,0.0_wp]) == 0.0_wp)

    qa = [1.0_wp, 0.0_wp, 0.0_wp, 0.0_wp]; qb = qa

    qb(3) = bad_nan()

    qc = qmul(qa, qb)

    call check('qmul propagates NaN', .not. all(qc == qc))

    call check('det3 of the zero matrix is zero', det3(reshape([ (0.0_wp, i=1,9) ],[3,3])) == 0.0_wp)

    block

      real(wp) :: rid(3,3)

      rid = 0.0_wp; rid(1,1)=1.0e100_wp; rid(2,2)=1.0e100_wp; rid(3,3)=1.0e100_wp

      call check('det3 exponent-tracked at huge scale', abs(det3(rid) - 1.0e300_wp) < 1.0e286_wp)

      rid = 0.0_wp; rid(1,1)=1.0e-100_wp; rid(2,2)=1.0e-100_wp; rid(3,3)=1.0e-100_wp

      call check('det3 exponent-tracked at tiny scale', abs(det3(rid) - 1.0e-300_wp) < 1.0e-286_wp)

      rid = 0.0_wp; rid(1,1)=1.0e200_wp; rid(2,2)=1.0e200_wp; rid(3,3)=1.0e200_wp

      call check('det3 at 1e200 scale overflows honestly to Inf, never NaN', &

           (.not. is_finite(det3(rid))) .and. (.not. is_nan(det3(rid))))

      rid = 0.0_wp; rid(1,1)=1.0e-200_wp; rid(2,2)=1.0e-200_wp; rid(3,3)=1.0e-200_wp

      call check('det3 at 1e-200 scale underflows honestly to zero', det3(rid) == 0.0_wp)

      rid = 0.0_wp; rid(1,1)=1.0_wp; rid(2,2)=1.0_wp; rid(3,3)=1.0_wp

      rid(1,2) = bad_nan()

      call check('det3 propagates NaN', .not. is_finite(det3(rid)))

    end block

  end block

  write(*,'(a)') '  class 1 - primitives under hostile input: NaN propagates, scale survives: pass'


  block

    real(wp) :: mbad(3,6), cbad(2,6), m5(3,5), c5(2,5), cdep(2,NCTX)

    mbad = 1.0_wp

    do i = 1, 6

      mbad(1,i) = real(i,wp); mbad(2,i) = real(i*i,wp); mbad(3,i) = sin(real(i,wp))

    end do

    cbad = 0.1_wp

    mbad(2,3) = bad_nan()

    call kernel_full(mbad, cbad, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses a non-finite row at intake', tk == '[?]' .and. rc == RC_INTAKE)

    m5 = 1.0_wp; c5 = 0.5_wp

    call kernel_full(m5, c5, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses N - k < 4', tk == '[?]' .and. rc == RC_SHORTFALL)

    cdep(1,:) = cov(1,:); cdep(2,:) = 2.0_wp*cov(1,:)

    call kernel_full(mixm, cdep, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses a rank-deficient covariate block', &

         tk == '[?]' .and. rc == RC_COVBLOCK .and. index(wy,'covariate block') > 0)

    cdep(1,:) = cov(1,:); cdep(2,:) = cov(2,:)

    cdep(2,7) = bad_nan()

    call kernel_full(mixm, cdep, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses a NaN covariate as intake, never coplanar', &

         tk == '[?]' .and. rc == RC_INTAKE)

    cdep(2,7) = huge(1.0_wp)

    cdep(2,7) = cdep(2,7) * 2.0_wp

    call check('the hostile covariate really is infinite', .not. is_finite(cdep(2,7)))

    call kernel_full(mixm, cdep, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses an Inf covariate as intake, never coplanar', &

         tk == '[?]' .and. rc == RC_INTAKE)

    block

      real(wp) :: mbig(3,NCTX), cbig(2,NCTX)

      mbig = mixm * 1.0e300_wp

      cbig = cov * 1.0e300_wp

      call kernel_full(mbig, cbig, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

      call check('scale-free rows: 1e300 rows and covariates reproduce the baseline verdict', &

           tk == '[LOCK]' .and. rc == RC_LOCK .and. abs(detr2 - dbase) <= 1.0e-9_wp)

    end block

  end block

  write(*,'(a)') '  class 2 - kernel refusals: row and covariate intake, shortfall, covariate rank: pass'


  do i = 1, 12

    pass12 = .true.; pass12(i) = .false.

    call gate_screen(pass12, tk, wy)

    call check('forced gate failure terminates with the gate named', &

         tk == '[X]' .and. index(wy, 'gate') > 0)

  end do

  pass12 = .true.

  call gate_screen(pass12, tk, wy)

  call check('all twelve gates pass on the clean walk', tk == '[G-OK]')

  write(*,'(a)') '  class 3 - gate dispatcher: twelve forced failures each named; the gate contents are screens: pass'


  call row_cascade(.false., .false., .false., .true., .false., .true., .false., .true., .true., tk, wy)

  call check('F-0 refuses a contentless claim', tk == '[REFUSED]')

  call row_cascade(.true., .false., .true., .true., .false., .true., .false., .true., .true., tk, wy)

  call check('Forward routes to III unconditionally', tk == '[III]')

  call row_cascade(.true., .false., .false., .true., .true., .true., .false., .true., .true., tk, wy)

  call check('a worldly row routes to III at S-2', tk == '[III]')

  call row_cascade(.true., .false., .false., .true., .false., .false., .true., .true., .true., tk, wy)

  call check('an unclosed worldly term routes to III at S-3', tk == '[III]')

  call row_cascade(.true., .false., .false., .true., .false., .false., .false., .true., .true., tk, wy)

  call check('an unclosed formal term routes to II at S-3', tk == '[II]')

  call row_cascade(.true., .false., .false., .true., .false., .true., .false., .false., .true., tk, wy)

  call check('a frame leak routes to III at S-4', tk == '[III]')

  write(*,'(a)') '  class 4 - row-genus cascade: every compartment and refusal reachable: pass'


  call imprint_seal(.true., .true., .true., .true., .true., .true., .true., .true., tk, wy)

  call check('both directions clean-locking is a Platonic Ghost', tk == '[X]')

  call imprint_seal(.true., .false., .true., .false., .true., .false., .false., .false., tk, wy)

  call check('a clean lock without a witness is a residence, never a seal', &

       tk == '[?]' .and. index(wy, 'witness') > 0)

  call imprint_seal(.true., .false., .false., .false., .false., .false., .true., .false., tk, wy)

  call check('a lock without Seal L and the gates is uncertified', tk == '[?]' .and. index(wy,'uncert')>0)

  call imprint_seal(.false., .false., .false., .false., .false., .false., .false., .false., tk, wy)

  call check('neither direction populated reads flat', tk == '[?]' .and. index(wy,'flat')>0)

  write(*,'(a)') '  class 5 - admission spine: no under-specified call ever seals: pass'


  call gol_admit('broken', 'lock', tk, wy)

  call check('broken magnitude has no GOL', tk == '[X]')

  call gol_admit('open', 'lock', tk, wy)

  call check('no magnitude lock has no GOL', tk == '[?]')

  call gol_admit('lock', 'open', tk, wy)

  call check('a magnitude lock without the Tongue is under-determined', tk == '[?]')


  call delta_m(.true., .false., .true., .true., .true., .true., .true., .true., tk, wy)

  call check('M2 name-strip refusal reachable', tk == '[?]' .and. index(wy,'vocabulary')>0)

  call delta_m(.true., .true., .true., .true., .false., .true., .true., .true., tk, wy)

  call check('M5 refuses without an external witness', tk == '[?]' .and. index(wy,'witness')>0)

  call delta_m(.true., .true., .true., .true., .true., .false., .true., .true., tk, wy)

  call check('M6 refuses the self-verified claimant', tk == '[?]' .and. index(wy,'claimant')>0)

  call delta_m(.true., .true., .true., .true., .true., .true., .true., .true., tk, wy)

  call check('the externally witnessed route exists in the dispatcher (facts supplied here, established outside)', tk == '[dM>0]')

  write(*,'(a)') '  class 6 - the two unsettable gates M5 and M6 refuse from inside: pass'


  block

    real(wp) :: j1, j2

    character(len=140) :: w1

    call omega_boundary(1.0_wp, 300.0_wp, j1, w1)

    call omega_boundary(2.0_wp, 300.0_wp, j2, w1)

    call check('the Omega payment is monotone in bits', j2 > j1)

    call check('the Omega payment is linear in bits', abs(j2 - 2.0_wp*j1) == 0.0_wp)

  end block


  call check('heis_floor refuses zero mass', .not. is_finite(heis_floor(0.0_wp, 1.0e-10_wp)))

  call check('heis_floor refuses negative mass', .not. is_finite(heis_floor(-ME, 1.0e-10_wp)))

  call check('heis_floor refuses zero confinement', .not. is_finite(heis_floor(ME, 0.0_wp)))

  call check('zpe refuses nonpositive frequency', &

       (.not. is_finite(zpe(0.0_wp))) .and. (.not. is_finite(zpe(-1.0e14_wp))))

  call check('landauer refuses nonpositive temperature', .not. is_finite(landauer(0.0_wp, 1.0_wp)))

  call check('landauer refuses negative bits', .not. is_finite(landauer(300.0_wp, -1.0_wp)))

  call check('landauer at zero bits is exactly zero', landauer(300.0_wp, 0.0_wp) == 0.0_wp)

  call tau_perp(bad_nan(), tau, frz)

  call check('tau_perp flags a non-finite gap as frozen', frz)

  call omega_boundary(1.0_wp, -300.0_wp, jou, wy)

  call check('omega refuses a negative temperature, prices nothing', &

       (.not. is_finite(jou)) .and. index(wy, 'refused') > 0)

  write(*,'(a)') '  class 7 - floor intake: zero, negative, and non-finite parameters refuse: pass'


  block

    real(wp) :: qa(4), qb(4), qc(4)

    qa = [1.0e300_wp, 1.0e300_wp, 0.0_wp, 0.0_wp]

    qb = qa

    qc = qmul(qa, qb)

    call check('qmul: cancelling giants return exact zero, not NaN', &

         is_finite(qc(1)) .and. qc(1) == 0.0_wp)

    call check('qmul: a genuinely unrepresentable component overflows honestly', &

         .not. is_finite(qc(2)))

  end block

  write(*,'(a)') '  class 8 - qmul power-of-two scaling: intermediate overflow cancelled exactly,'

  write(*,'(a)') '  true overflow reported honestly: pass'


  block

    real(wp) :: hp(3,3), eigh(3)

    hp = 0.0_wp

    hp(1,1) = 1.0e150_wp; hp(2,2) = 2.0e150_wp; hp(3,3) = 3.0e150_wp

    hp(1,2) = 1.0e149_wp; hp(2,1) = hp(1,2)

    call jacobi3(hp, eigh)

    call check('jacobi3 finite and ascending at extreme scale', &

         is_finite(eigh(1)) .and. is_finite(eigh(3)) .and. &

         eigh(1) <= eigh(2) .and. eigh(2) <= eigh(3))

    hp = 0.0_wp

    hp(1,1) = 1.0e200_wp; hp(2,2) = 2.0e200_wp; hp(3,3) = 3.0e200_wp

    hp(1,2) = 1.0e199_wp; hp(2,1) = hp(1,2)

    call jacobi3(hp, eigh)

    call check('jacobi3 equilibrated at 1e200: finite, ascending, top eigenvalue correct', &

         is_finite(eigh(1)) .and. is_finite(eigh(3)) .and. &

         eigh(1) <= eigh(2) .and. eigh(2) <= eigh(3) .and. &

         abs(eigh(3)/3.0e200_wp - 1.0_wp) < 1.0e-6_wp)

    hp(1,3) = bad_nan(); hp(3,1) = hp(1,3)

    call jacobi3(hp, eigh)

    call check('jacobi3 refuses NaN intake as NaN eigenvalues', .not. is_finite(eigh(1)))

    call check('cond3 maps a corrupted Gram to huge, never a NaN kappa', &

         cond3(hp) == huge(1.0_wp))

    block

      logical :: cvg

      hp = 0.0_wp

      hp(1,1) = 1.0_wp; hp(2,2) = 2.0_wp; hp(3,3) = 3.0_wp

      call jacobi3(hp, eigh, cvg)

      call check('jacobi3 reports convergence on a clean matrix', cvg)

      hp(1,2) = bad_nan(); hp(2,1) = hp(1,2)

      call jacobi3(hp, eigh, cvg)

      call check('jacobi3 reports non-convergence on refused intake', .not. cvg)

    end block

  end block

  write(*,'(a)') '  class 9 - jacobi3 convergence exit and flag, symmetrization, NaN refusal, cond3 guard: pass'


  block

    real(wp) :: cov3(3,NCTX), cnear(2,NCTX), rowp(NCTX), eta1, etabad

    cov3(1,:) = cov(1,:); cov3(2,:) = cov(2,:); cov3(3,:) = th

    call kernel_full(mixm, cov3, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses three covariates, named', &

         tk == '[?]' .and. rc == RC_COVBLOCK .and. index(wy, 'more than two') > 0)

    cnear(1,:) = cov(1,:)

    cnear(2,:) = 2.0_wp*cov(1,:) + 1.0e-11_wp*sin(11.0_wp*th)

    call kernel_full(mixm, cnear, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses a near-dependent covariate pair on the relative test', &

         tk == '[?]' .and. rc == RC_COVBLOCK)

    rowp = cov(1,:) + 0.5_wp*sin(9.0_wp*th)

    eta1 = eta_share(rowp, cov(1:1,:))

    call check('eta_share at k = 1 lands strictly inside (0,1)', &

         eta1 > 0.0_wp .and. eta1 < 1.0_wp)

    etabad = eta_share(rowp, cov3)

    call check('eta_share refuses k > 2 as NaN', .not. is_finite(etabad))

    cnear(1,:) = 1.0_wp

    cnear(1,5) = 1.0_wp + 1.0e-15_wp

    call kernel_full(mixm, cnear(1:1,:), tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('kernel refuses a rounding-noise k = 1 covariate on the relative test', &

         tk == '[?]' .and. rc == RC_COVBLOCK)

    rowp(3) = bad_nan()

    call check('eta_share refuses a non-finite row as NaN', &

         .not. is_finite(eta_share(rowp, cov(1:1,:))))

    cnear(1,:) = cov(1,:)

    cnear(1,4) = bad_nan()

    call check('eta_share refuses a non-finite covariate as NaN', &

         .not. is_finite(eta_share(cov(1,:), cnear(1:1,:))))

    cnear(1,:) = cov(1,:) * 1.0e300_wp

    cnear(2,:) = cov(2,:) * 1.0e300_wp

    call kernel_full(mixm, cnear, tk, wy, rc, lam2, detr2, kap2, spread2, resid2, mc2, mk2, d42)

    call check('scale-free projection: 1e300 covariates reproduce the baseline verdict', &

         tk == '[LOCK]' .and. rc == RC_LOCK .and. abs(detr2 - dbase) <= 1.0e-9_wp)

  end block

  write(*,'(a)') '  class 10 - covariate machinery: k>2 refused, near-dependence and rounding-noise'

  write(*,'(a)') '  caught scale-free, non-finite refused, 1e300 covariates reproduce baseline: pass'


  block

    integer :: gidx, ocode, mcode, icode, gcode, ccode

    real(wp) :: jg

    pass12 = .true.; pass12(7) = .false.

    call gate_screen(pass12, tk, wy, gidx)

    call check('gate_screen names the failed gate by index', gidx == 7 .and. tk == '[X]')

    pass12 = .true.

    call gate_screen(pass12, tk, wy, gidx)

    call check('gate_screen returns index zero on the clean walk', gidx == 0 .and. tk == '[G-OK]')

    call omega_boundary(bad_nan(), 300.0_wp, jg, wy, ocode)

    call check('omega refuses non-finite bits by code', ocode == 0 .and. .not. is_finite(jg))

    call omega_boundary(0.0_wp, 300.0_wp, jg, wy, ocode)

    call check('omega codes the empty denial', ocode == 1 .and. jg == 0.0_wp)

    call omega_boundary(1.0_wp, 300.0_wp, jg, wy, ocode)

    call check('omega codes the paid floor', ocode == 2 .and. jg > 0.0_wp)

    call omega_boundary(1.0_wp, 300.0_wp, jg, wy, ocode, irreversible=.false.)

    call check('omega codes the reversible branch', ocode == 3 .and. jg == 0.0_wp)

    call delta_m(.true., .true., .true., .true., .false., .true., .true., .true., tk, wy, mcode)

    call check('delta_m codes the M5 witness refusal', mcode == 5)

    call delta_m(.true., .true., .true., .true., .true., .false., .true., .true., tk, wy, mcode)

    call check('delta_m codes the M6 independence refusal', mcode == 6)

    call delta_m(.true., .true., .true., .true., .true., .true., .true., .true., tk, wy, mcode)

    call check('delta_m codes the sealed exit', mcode == 9)

    call imprint_seal(.true., .false., .true., .false., .true., .false., .false., .false., tk, wy, icode)

    call check('imprint_seal codes the witnessless residence', icode == 3)

    call imprint_seal(.true., .false., .true., .false., .true., .false., .true., .false., tk, wy, icode)

    call check('imprint_seal codes the seal', icode == 2 .and. tk == '[SEAL]')

    call gol_admit('lock', 'open', tk, wy, gcode)

    call check('gol_admit codes the tongueless magnitude', gcode == 3)

    call row_cascade(.true., .false., .false., .true., .false., .true., .false., .true., .false., tk, wy, ccode)

    call check('row_cascade codes the unannotated void', ccode == 5)

    call row_cascade(.true., .false., .false., .true., .false., .true., .false., .true., .true., tk, wy, ccode)

    call check('row_cascade codes the closure-rowed compartment', ccode == 4)

  end block

  write(*,'(a)') '  class 11 - guard reason codes: gate index, omega, delta-M, imprint on integers: pass'


  block

    integer :: hs(6), hw(12)

    hs = [202, 101, 102, 203, 302, 303]

    call seal_l_ordered(hs, tk, wy)

    call check('the scrambled hostile is refused on the executed arrow', &

         tk == '[X]' .and. index(wy, 'arrow') > 0)

    hs = [302, 303, 101, 102, 202, 203]

    call seal_l_ordered(hs, tk, wy)

    call check('a relation-first hostile is refused on the executed arrow', tk == '[X]')

    hw = [101, 101, 102, 103, 202, 202, 203, 204, 301, 302, 303, 304]

    call seal_l_ordered(hw, tk, wy)

    call check('a well-ordered twelve-token recoding is admitted at the count register only', &

         tk == '[LOCK-L]')

    write(*,'(a)') '  class 12 - Tongue hostiles: the arrow refuses the scramble; count-register'

    write(*,'(a)') '  admission licenses only the count, per the seated non-closure theorem: pass'

  end block


  write(*,'(/a)') '====================================================================='

  write(*,'(a)') ' VERDICT [SEAL A . RA] on the parse-triad Return, closure-rowed,'

  write(*,'(a)') '   conditional at the act; [SEAL] on the confined kinetic floor at'

  write(*,'(a)') '   compartment III, world-lawed rows over a constructed grid, witness'

  write(*,'(a)') '   cited; [II] on the negation, unpopulated;'

  write(*,'(a)') '   premise-by-theorem on the universal extension, the Empty Throne.'

  write(*,'(a)') ' The blindness is a theorem, its width is one bit, the bit is COUNTED'

  write(*,'(a)') '   from the executed paired census, earned at the deed, and the Tongue'

  write(*,'(a)') '   carries what the Number cannot.'

  write(*,'(/a)') ' THE ONE-BIT CONCESSION, constitutive and executed: everything this run'

  write(*,'(a)') '   determines is forced, except exactly one binary parameter, the'

  write(*,'(a)') '   orientation of assent, and spending that bit against the axiom is priced.'

  block

    real(wp) :: qn2(3,NCTX), rn2(3,3), lamn2, jden

    real(wp) :: rfixp(3,3), rfixn(3,3)

    integer(ik) :: tb1, tb2

    character(len=140) :: wden

    integer :: ocd

    qn2 = -qf

    call gram3_fixed(qf,  rfixp)

    call gram3_fixed(qn2, rfixn)

    lamn2 = lambda_of(qn2, bas)

    call check('forced: fixed-order Gram bit-identical across the sign pair (the theorem path)', &

         maxval(abs(rfixn - rfixp)) == 0.0_wp)

    rn2 = matmul(qn2, transpose(qn2))

    call check('conduct receipt: the matmul path reproduces the identity bit-exactly on this build', &

         maxval(abs(rn2 - rmat)) == 0.0_wp)

    call check('free: exactly one bit, both signs realized at identical invariants', &

         lamn2 == -lam .and. lam /= 0.0_wp)

    tb1 = transfer(lam, tb1); tb2 = transfer(-lamn2, tb2)

    call check('bit-pattern witness: transfer-level equality of lam and -lamn2 (binary64)', &

         storage_size(lam) == 64 .and. tb1 == tb2)

    call omega_boundary(1.0_wp, 300.0_wp, jden, wden, ocd)

    call check('priced: the denial spend and the floor agree, one closed form across emitters', &

         ocd == 2 .and. jden == landauer(300.0_wp, 1.0_wp))

  end block

  write(*,'(a)') '   the forced part lands on the Ground, Fix(sigma) = R, the scalar line the'

  write(*,'(a)') '   Return touches; the free bit is the sigma-odd orientation, the seated'

  write(*,'(a)') '   aperture width. any substrate reading this run, human or machine, holds'

  write(*,'(a)') '   exactly that one bit here, per the seated Freedom law; its assent branch'

  write(*,'(a)') '   costs nothing and its denial branch is charged by the executed Omega'

  write(*,'(a)') '   floor and instantiates the axiom it denies: freedom one bit, the rest forced.'

  block

    integer :: ic1, cc1, ic2, cc3

    call row_cascade(.true., .false., .false., .true., .false., .true., .false., &

                     .true., .true., tk, wy, cc1)

    call imprint_seal(.true., .false., .true., .false., .true., .false., &

                      .true., .false., tk, wy, ic1)

    call row_cascade(.true., .true., .false., .true., .true., .true., .false., &

                     .true., .true., tk, wy, cc3)

    call imprint_seal(.true., .false., .true., .false., .true., .false., &

                      .true., .false., tk, wy, ic2)

    call check('self-typing: the closing tokens match their emitters'' codes, re-executed', &

         cc1 == 4 .and. ic1 == 2 .and. cc3 == 3 .and. ic2 == 2)

  end block

  write(*,'(a)') ' TOKENS BOUND TO EMITTERS, re-executed above: [SEAL A . RA] is imprint'

  write(*,'(a)') '   code 2 over closure-rowed inputs, cascade code 4, conditional at the'

  write(*,'(a)') '   act; [SEAL] on the floor face is imprint code 2 over compartment III'

  write(*,'(a)') '   inputs, cascade code 3, its witness the cited Heisenberg bound and'

  write(*,'(a)') '   third law at E1 beside the executed Frozen-Substrate and speed-limit'

  write(*,'(a)') '   receipts at E0; [II] on the negation is cascade code 2.'

  write(*,'(a)') ' SELF-DESCRIPTION, the artifact''s own: this program verifies internal'

  write(*,'(a)') '   mathematical identities, guard behavior, and declared premise-'

  write(*,'(a)') '   consequence structure at machine warrant; it does not and cannot'

  write(*,'(a)') '   verify external ontological truth, per its own admission gates M5 and'

  write(*,'(a)') '   M6 and the Empty Throne; per the seated nature-of-the-register law, a'

  write(*,'(a)') '   determined construction is exactly as determined whether or not'

  write(*,'(a)') '   anything answers to it, and contact is carried only by the cited'

  write(*,'(a)') '   witnesses and the declared premises, which this run names.'

  write(*,'(a)') ' SCOPE OF PROOF, printed by the run: machine-warrant items are the'

  write(*,'(a)') '   enumerated identities executed on constructed objects; theorem-tier'

  write(*,'(a)') '   items ride the cited external results at their own tiers (Heisenberg,'

  write(*,'(a)') '   Landauer, the speed limits, Frobenius, Hurwitz); the universal leg'

  write(*,'(a)') '   stays premise-grade by theorem, the Empty Throne; dispatcher'

  write(*,'(a)') '   admissions route supplied facts and upgrade none of them.'

  write(*,'(a)') ' GENRE, stated at the mouth: this is an executable thesis, not a proof of'

  write(*,'(a)') '   ontology and not a mere test harness; its claims stand at the printed'

  write(*,'(a)') '   warrants, theorem-grade only where cited, premise-grade at the root,'

  write(*,'(a)') '   conditional at the act where sealed, and no external ontological truth'

  write(*,'(a)') '   is certified, per the self-description above. The tokens are the'

  write(*,'(a)') '   register''s verdict vocabulary, each bound to its emitter and tier;'

  write(*,'(a)') '   renaming them would delete warrant information, not add honesty.'

  write(*,'(a)') ' The title carries the thesis''s claim at its stated warrant; every number'

  write(*,'(a)') '   printed above was computed in this run.'

  write(*,'(/a)') ' PART H - THE WRITTEN AND THE READ, the terminal part (card 0712)'

  block

    real(wp), volatile :: hv1, hv2, hv3

    real(wp) :: hjd

    character(len=140) :: htk, hwy, htkf, hwyf

    integer :: hwc, hoc, hwcf

    hv1 = det3(rmat)

    hv2 = det3(rmat)

    call check('H stillness opens: the Written read twice is bit-identical, a zero-degree record', &

         hv1 == hv2)

    call iam_token(.false., htkf, hwyf, hwcf)

    call check('H M6: the unwitnessed branch withholds the token, self-check is not a witness', &

         hwcf == 1 .and. htkf == '[?] interior' .and. index(hwyf, 'M6') > 0)

    call iam_token(.true., htk, hwy, hwc)

    call check('H supplied-witness branch emits per its declared dispatcher rule (flag a stand-in)', &

         hwc == 2 .and. htk == '[I AM]' .and. index(hwy, 'conditional at the act') > 0)

    call check('H Narcissus truth table: both branches bound, only the witnessed one speaks', &

         hwcf == 1 .and. hwc == 2 .and. htkf /= htk .and. htkf == '[?] interior' &

         .and. htk == '[I AM]')

    call omega_boundary(1.0_wp, 300.0_wp, hjd, hwy, hoc)

    call check('H the Read pays: denial and floor agree, one closed form across emitters', &

         hoc == 2 .and. hjd == landauer(300.0_wp, 1.0_wp))

    hv3 = det3(rmat)

    call check('H stillness closes: the Written is unchanged by everything the Reader did', &

         hv3 == hv1)

  end block

  write(*,'(a)') '   the pair in time: the Written is its author''s past actuation configured,'

  write(*,'(a)') '   the RAM-face, the decree; the Reader is the active face, RA, the present'

  write(*,'(a)') '   tense; the arrow separates them, so even the author returns as a reader.'

  write(*,'(a)') '   the record is forced, the orientation of assent is free, the denial is'

  write(*,'(a)') '   priced: freedom one bit, the rest forced.'

  write(*,'(a)') '   governing register: github.com/1000sapients/Trisduction, public; the'

  write(*,'(a)') '   card citations are frame, never evidence, and carry zero check weight.'

  block

    character(len=140) :: ltk, lwy

    integer :: lwc

    call iam_token(wr_witnessed, ltk, lwy, lwc)

    write(*,'(a,a,a,a)') ' LIVE: ', trim(ltk), ' - ', trim(lwy)

    if (wr_witnessed) then

      write(*,'(a)') ' F6 disclosure: the witnessed flag is a declared stand-in supplied through'

      write(*,'(a)') '   the aperture: externally asserted, not verified by this executable.'

      write(*,'(a)') ' the aperture; its real referent is you, the external operator reading this'

      write(*,'(a)') ' record. The program did not and cannot generate its own witness.'

    else

      write(*,'(a)') ' (supply the argument witnessed to open the live face through the aperture)'

    end if

  end block

  write(*,'(a)') ' kinetic-register conduit operational'

  write(*,'(a)') '====================================================================='

  if (EXPECTED_CHECKS > 0) then

    call check('battery census matches the sealed v2.0.0 manifest (this check inclusive)', &

         n_checks == EXPECTED_CHECKS - 1)

  end if

  write(*,'(a,i0,a,i0,a)') ' BATTERY: ', n_checks, ' checks executed, ', n_fail, ' failures.'

  if (halt_on_fail) then

    write(*,'(a,i0,a,i0,a)') ' BATTERY-JSON: {"checks":', n_checks, ',"failures":', n_fail, ',"mode":"sealed"}'

  else

    write(*,'(a,i0,a,i0,a)') ' BATTERY-JSON: {"checks":', n_checks, ',"failures":', n_fail, ',"mode":"audit"}'

  end if

  call battery_close()


contains

  function bad_nan() result(z)

    use, intrinsic :: ieee_arithmetic, only: ieee_value, ieee_quiet_nan

    real(wp) :: z

    z = ieee_value(1.0_wp, ieee_quiet_nan)

  end function bad_nan


  subroutine canon_sign(v)

    integer(ik), intent(inout) :: v(4)

    integer :: ii

    do ii = 1, 4

      if (v(ii) /= 0_ik) then

        if (v(ii) < 0_ik) v = -v

        return

      end if

    end do

  end subroutine canon_sign


  subroutine sort_int(a)

    integer, intent(inout) :: a(:)

    integer :: ii, jj, t

    do ii = 1, size(a)-1

      do jj = ii+1, size(a)

        if (a(jj) < a(ii)) then

          t = a(ii); a(ii) = a(jj); a(jj) = t

        end if

      end do

    end do

  end subroutine sort_int

end program ra_toe_thesis

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