17 27
 0  0  1 -1  0  1 -1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  1 -1  0  0  0  1 -1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  1 -1  0  0  0  1 -1  0  0  0  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  1 -1  0  0  0  0  1 -1  0  0  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  1 -1  0  0  0  0  1 -1  0  0  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  1 -1  0  0  0  0  1 -1  0  0  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  1 -1  0  0  0  1 -1  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  1 -1  0  0  0  1 -1  0  0  0
 0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  1 -1  0  1 -1  0
-1  1  1  0  1  0  0  0  1  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
-2  2  2  0  2  0  0  0  1  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0  0  0  0
-3  3  3  0  2  0  0  0  0  2  0  0  0  0  0  1  0  0  0  0  1  0  0  0  0  0  0
-4  4  3  0  0  3  0  0  0  0  2  0  0  0  0  0  2  0  0  0  0  1  0  0  1  0  0
-3  3  0  3  0  0  2  0  0  0  0  2  0  0  0  0  0  1  0  0  0  0  1  0  0  0  0
-2  2  0  2  0  0  0  2  0  0  0  0  1  0  0  0  0  0  1  0  0  0  0  0  0  0  0
-1  1  0  1  0  0  0  1  0  0  0  0  0  1  0  0  0  0  0  0  0  0  0  0  0  0  0
-2  1  1  0  1  0  0  0  1  0  0  0  0  0  1  0  0  0  0  0  1  0  0  0  1  0  1