| ubi-cons(apebs, vols, wlar, q, bflipset, vtblpnum, sqnum), vtblpnum0 = LEB_SIZE, ubi-io-inv(apebs), v ∈ vols, vtblpnum1 < # vols[v], vtblpnum2 + n ≤ vtblpnum0, n0 + n ≤ # buf ⊦ ⟪ubi_read#(v, vtblpnum1, vtblpnum2, n0, n, vols, vtblpnum0, apebs; buf, bflipset; err)⟫ ubi-cons(apebs, vols, wlar, q, bflipset, vtblpnum, sqnum) |