reject 0 reject 1 reject 00 01 reject 10 reject 11 reject 000 001 010 011 reject 100 101 reject 110 reject 111 reject 0000 0001 0010 0011 reject 0100 0101 reject 0110 reject 0111 reject 1000 1001 reject 1010 reject 1011 reject 1100 reject 1101 reject 1110 reject 1111 reject