7
0 8 9 6 7 7 8 
8 0 1 4 3 3 2 
9 1 0 3 2 2 1 
6 4 3 0 3 3 2 
7 3 2 3 0 2 1 
7 3 2 3 2 0 1 
8 2 1 2 1 1 0