| 256 = 2 ^ 8, i0 < 0 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(i0 * 256))))) = 0, ~256 ≠ i0 * 256 ∧ lastn(8, int2bits(i0 * 256)).first |
i0 < 0 ⊦ b2i(i2b(bits2int(lastn(8, int2bits(i0 * 2 ^ 8))))) = 0, ~256 ≠ i0 * 2 ^ 8 ∧ lastn(8, int2bits(i0 * 2 ^ 8)).first