| m < # apebs, # wlar = # apebs ⊦ valid-recs(subarray(apebs, 0, m), subarray(wlar, 0, m), recs) ∧ apebs[m] = mkpeb(aehdr, avidhdr(v, n, m0, m1, m4), buf, m2, boolvar) ∧ ¬ v × n ∈ recs → valid-recs(subarray(apebs, 0, m + 1), subarray(wlar[m, wl-entry(m3, used)], 0, m + 1), recs[v × n, recovery-entry(m, m0)]) |