| # apebs = # wlar, apebs[n] = mkpeb(aehdr, avhdr, buf1, m0, false), vols[v][vtblpnum3] = ⌜n⌝ , avols[v][vtblpnum3] = mapped(buf1, m), err = ESUCCESS, avhdr.valid?, n < # wlar, vtblpnum3 < # vols[v], vtblpnum3 < # avols[v], abs(avols, apebs, vols, q), bflipset-cons(bflipset, wlar), ebm-cons(avols), is-aligned(vtblpnum5, EB_PAGE_SIZE), ubi-io-inv(apebs), ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf1, m0, false)), unique-sqns(apebs), valid-ebatbl(apebs, wlar, vols, vtblpnum4), valid-eraseq(apebs, q), valid-eraseq(wlar, q), valid-eraseq(q), valid-global-sqn(apebs, sqnum), valid-vtbl(apebs, vols, wlar, vtblpnum4), valid-wl(apebs, wlar), v ∈ vols, v ∈ avols, m ≤ LEB_SIZE, m0 ≤ vtblpnum5, vtblpnum5 ≤ LEB_SIZE, n2 ≤ # buf, m ≤ vtblpnum5, m0 ≤ LEB_SIZE ⊦ ⟨skip⟩ (abs(avols, apebs, vols, q) ∧ ESUCCESS = err), VTBL_VOLID ∈ vols |