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