6 7
5 0 12 0 0 0 0
0 8 9 0 0 0 0
0 0 0 42 0 0 3
0 0 0 0 18 12 0
2 0 0 0 0 3 0
2 0 0 0 0 0 2
6 7
5 0 12 0 0 0 0
0 8 9 0 0 0 0
0 0 0 42 0 0 3
0 0 0 0 18 12 0
2 0 0 0 0 3 0
2 0 0 0 0 0 2