2
4
8
12
A = 0 ; B = 0
A = 0 ; B = 1
A = 1 ; B = 0
A = 1 ; B = 1
A = 0, B = 1
A = 1, B = 0
A = 0, B = 0
A = 1, B = 1
0010
0011
0101
0110
1000
1001
0111