z1 = (not z1 and not z0 and x) or (z1 and not z0 and not x) z0 = (not z1 and not z0) or (not z1 and not x) y = z0 and not x 0 0 0 0 1 0 0 0 1 1 1 0 0 1 0 0 1 1 0 1 1 0 0 0 1 0 0 1 0 0 1 0 1 0 0 0 1 1 0 0 0 1 1 1 1 0 0 0