8 31 7
1 1 1 1 1 4 4 2 3 3 4 7 1 3 3 3 3 3 1 5 7 6 3 5 3 4 1 1 1 3 6
0 5 4 0 3 0 0 3
0 0 0 0 0 7 4 4
0 0 3 0 0 0 1 0
0 0 3 0 0 4 1 3
0 1 0 2 0 0 1 0
0 3 6 0 0 0 0 3
0 7 1 5 0 6 0 3
0 0 3 0 0 3 0 0
