4
-1 -1 0 1 -1  0 0
1 -1  0 0  0  1 0
0  0  1 -1 -1 0 0
-1 -2 1 1 -2 1 0
0
5 4 2
-1 -1 0
-1 -2 1
1 -2 1
1 -1  0
0  0  1
-1 -1 0 1 -1  0 0 1
-1 -2 1 1 -2 1 0 1
1 -1  0 0  0  1 0 1
0  0  1 -1 -1 0 0 1
