| n0 < n1, n1 ≤ # apebs ⊦ valid-peb(v, m, mkpeb(aehdr, avhdr, buf, m0, boolvar)) ∧ apebs[n0] = mkpeb(aehdr, avhdr, buf, m0, boolvar) → avhdr.sqn ∈ valid-sqns(v, m, apebs, n1) |
apebs[n0] = mkpeb(aehdr, avhdr, buf, m0, boolvar), n0 < n1, valid-peb(v, m, mkpeb(aehdr, avhdr, buf, m0, boolvar)), n1 ≤ # apebs ⊦ avhdr.sqn ∈ valid-sqns(v, m, apebs, n1)