| n < # wlar, # wlar = # apebs ⊦ wlar[n].status = used ∧ valid-ebatbl(apebs, wlar, vols, n0) ∧ valid-wl(apebs, wlar) ∧ n0 ≠ n → apebs[n].vidhdr.vol ∈ vols ∧ apebs[n].vidhdr.leb < # vols[apebs[n].vidhdr.vol] ∧ vols[apebs[n].vidhdr.vol][apebs[n].vidhdr.leb] = ⌜n⌝ |