9 16
1 1 1 1 -1 -1 -1 -1  0  0  0  0  0  0  0  0 
1 1 1 1  0  0  0  0 -1 -1 -1 -1  0  0  0  0 
1 1 1 1  0  0  0  0  0  0  0  0 -1 -1 -1 -1 
0 1 1 1 -1  0  0  0 -1  0  0  0 -1  0  0  0 
1 0 1 1  0 -1  0  0  0 -1  0  0  0 -1  0  0 
1 1 0 1  0  0 -1  0  0  0 -1  0  0  0 -1  0 
1 1 1 0  0  0  0 -1  0  0  0 -1  0  0  0 -1 
0 1 1 1  0 -1  0  0  0  0 -1  0  0  0  0 -1 
1 1 1 0  0  0 -1  0  0 -1  0  0 -1  0  0  0 
