0  1 10 2  N   N N  N
1  0  N N  1   N N  N 
10 N  0 N  N   1 2  N 
2  N  N 0  N   N 10 N
N  1  N N  0   N 1  100
N  N  1 N  N   0 N  2
N  N  2 10 1   N 0  4
N  N  N N  100 2 4  0