7
0 31 29 23 18 23 22 
31 0 16 14 17 12 13 
29 16 0 10 19 10 11 
23 14 10 0 15 6 7 
18 17 19 15 0 11 8 
23 12 10 6 11 0 3 
22 13 11 7 8 3 0