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