0 -1 -1  0  1  1  0
-1 -2 -2  0  2  2  1
-1 -2 -3  0  3  2  1
-1 -2 -3  0  3  2  1
-1 -2 -3  0  3  2  1
-1 -2 -2  0  2  2  1
 0 -1 -1  0  1  1  0