8
         0         0         0
         1         0         0
         1         1         1
         1         0         1
         0         1         1
         0         0         1
         0         1         0
         1         1         0
12
       2       1       7
       8       2       7
       6       1       2
       4       6       2
       4       3       5
       5       6       4
       8       3       4
       8       4       2
       5       3       8
       7       5       8
       1       6       5
       7       1       5