| boolvar ∧ ¬ bits.first ∧ bits ≠ [] ⊦ bits = [], bits0 = [], bits2int(bits) * 2 + 1 = bits2int(bits0 + boolvar ') ↔ bits2int(bits) = bits2int(bits0) |
⊦ bits0 = [], bits2int(bits) * 2 + 1 = bits2int(bits0 + true ') ↔ bits2int(bits) = bits2int(bits0), bits = [], bits.first