| # buf = (n2 + n1) * LEB_SIZE, buf0 = buf, m = 0, m0 = n3 + n1, n = LEB_SIZE, n0 = n1 * LEB_SIZE, subarray(buf, 0, n1 * LEB_SIZE) = lebs(avol, n3, n1), m0 < # avol, ebm-vol-inv(avol), mapped-full?(avol, n3, n2 + n1), n3 + n2 + n1 ≤ # avol ⊦ n2 = 0, m0 < # avol |