| # apebs = # wlar, vols[v][vtblpnum2] = unmapped, err = err1, vtblpnum2 < # avols0[v], vtblpnum2 < # vols[v], abs(avols0, apebs0, vols0, q0), abs(avols0, apebs, vols, q), bflipset-cons(bflipset, wlar), ebm-cons(avols0), ubi-io-inv(apebs), unique-sqns(apebs), valid-ebatbl(apebs, wlar, vols, vtblpnum3), valid-eraseq(q), valid-eraseq(wlar, q), valid-eraseq(apebs, q), valid-global-sqn(apebs, sqnum), valid-vtbl(apebs, vols, wlar, vtblpnum3), valid-wl(apebs, wlar), v ∈ avols0, v ∈ vols, ⌊err1⌋ ⊦ ⟨skip⟩ (abs(avols0, apebs0, vols0, q0) ∧ err1 = err), avols0[v][vtblpnum2].mapped?, VTBL_VOLID ∈ vols |