| m < # apebs, # apebs = # wlar ⊦ valid-wl(subarray(apebs, 0, m), subarray(wlar, 0, m)) ∧ valid-peb(v, n, apebs[m]) ∧ (valid-sqns(v, n, apebs, m) ≠ ∅ → apebs[m].vidhdr.sqn < valid-sqns(v, n, apebs, m).max) → valid-wl(subarray(apebs, 0, m + 1), subarray(wlar[m, wl-entry(m0, erasing)], 0, m + 1)) |