10 20
4 7 4 4 1 0 -1
0 4 1 4 1 4 1 1 1 3 -1
1 3 4 6 2 4 -1
0 7 9 4 -1
0 1 4 9 1 1 4 0 -1
0 1 1 3 1 8 1 5 -1
0 1 1 1 1 1 1 8 1 1 3 1 -1
0 1 1 3 1 1 3 1 2 1 1 1 3 1 -1
0 1 5 1 1 6 1 1 3 1 -1
0 7 3 4 1 1 3 1 -1
