| 8 ≠ # fillsgn(8, bitsand(int2bits(i), int2bits(j))), 8 = # fillsgn(8, int2bits(i)), # int2bits(j) < 8, # int2bits(i) < 8 ⊦ bitsand(fillsgn(8, int2bits(i)), int2bits(j)) = [], lastn(8, fillsgn(8, bitsand(int2bits(i), int2bits(j)))) = lastn(8, fillsgn(8, bitsand(fillsgn(8, int2bits(i)), int2bits(j)))) |
8 = # fillsgn(8, int2bits(i)), # int2bits(i) < 8, # int2bits(j) < 8 ⊦ 8 = # fillsgn(8, bitsand(int2bits(i), int2bits(j))), lastn(8, fillsgn(8, bitsand(int2bits(i), int2bits(j)))) = lastn(8, fillsgn(8, bitsand(fillsgn(8, int2bits(i)), int2bits(j)))), bitsand(fillsgn(8, int2bits(i)), int2bits(j)) = []