4 4
16
1 1 1 1
2 1 2 1
3 1 3 1
1 2 1 2
2 2 2 2
3 2 3 2
1 3 1 3
2 3 2 3
3 3 3 3
0 0 4 0
0 0 0 4
4 0 4 4
4 4 0 4
0 3 3 3
2 3 5 3
3 0 3 3