7
0 22 23 16 12 17 16 
22 0 9 8 12 7 8 
23 9 0 7 13 6 7 
16 8 7 0 10 3 4 
12 12 13 10 0 9 6 
17 7 6 3 9 0 3 
16 8 7 4 6 3 0