⊦ bits ≠ [] → # bits2bytes(bits) = (# bits - 1) / 8 + 1
bits ≠ [] ⊦ # bits % 8 = 0, (# bits - 1) / 8 + 1 = # bits / 8 + 1
Used simplifier rules: ⊦ # [] = 0; Used terms: bits