{0,1,2} {0,1,2}

0 0
0 0 -> 0
0 1 -> 1
1 1 -> 0
1 2 -> 1
2 2 -> 2

1 1
2 0 -> 3

2 0
0 0 -> 0
0 1 -> 1
1 1 -> 0

3 1
1 0 -> 1
