3
0  0 -1 0 -1 -1 0
0 -1  1 0 -1 -1 0
0  0 -1 0 -1  0 0
0
4 3 1
0 0 -1
0 -1 -1
0 -1 0
0 -1 1
0  0 -1 0 -1 -1 0 2
0 -1 -1 0 -1  0 0 2
0 -1  1 0 -1  0 0 1
