| # bits % 8 ≠ 0, # bits = m * 8 + n0, ((8 - n0) + # bits) % 8 = 0, n0 < 8, # bits / 8 + 1 < n, m < n ⊦ bits = [], n * 8 = # bits, n0 = 0, mklist(false, 8 - n0) + bits = [], n - 1 - m = 0, mklist(i2b(0), n - # bits / 8 + 1) + bits2bytes(bits) = mklist(i2b(0), n - 1 - m) + bits2bytes(mklist(false, 8 - n0) + bits), bits.first |
((8 - n0) + # bits) % 8 = 0, # bits = m * 8 + n0, m < n, # bits / 8 + 1 < n, n0 < 8 ⊦ # bits % 8 = 0, mklist(i2b(0), n - # bits / 8 + 1) + bits2bytes(bits) = mklist(i2b(0), n - 1 - m) + bits2bytes(mklist(false, 8 - n0) + bits), n - 1 - m = 0, mklist(false, 8 - n0) + bits = [], n0 = 0, n * 8 = # bits, bits = [], bits.first