7
0 23 22 16 11 17 16 
23 0 11 7 12 6 7 
22 11 0 8 17 9 10 
16 7 8 0 11 3 4 
11 12 17 11 0 10 7 
17 6 9 3 10 0 3 
16 7 10 4 7 3 0