| avhdr.sqn = valid-sqns(v0, m1, apebs).max, vols[v][m] = ⌜n⌝ , wlar[n] = wl-entry(m0, used), apebs[n] = mkpeb(aehdr, avhdr, buf, m2, boolvar), aehdr = aechdr(m0), ¬ boolvar, n < # wlar, m < # vols[v], valid-ebatbl(apebs, wlar, vols, n0), valid-peb(v0, m1, apebs[n]), v ∈ vols ⊦ n = n0, v0 = v ∧ m1 = m |
avhdr.sqn = valid-sqns(v0, m1, apebs).max, apebs[n] = mkpeb(aechdr(m0), avhdr, buf, m2, false), wlar[n] = wl-entry(m0, used), vols[v][m] = ⌜n⌝ , m < # vols[v], n < # wlar, valid-ebatbl(apebs, wlar, vols, n0), valid-peb(v0, m1, mkpeb(aechdr(m0), avhdr, buf, m2, false)), v ∈ vols ⊦ n = n0, v0 = v ∧ m1 = m