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
 
