7
0 21 22 15 13 17 16 
21 0 11 10 12 8 9 
22 11 0 7 13 7 8 
15 10 7 0 10 4 5 
13 12 13 10 0 8 5 
17 8 7 4 8 0 3 
16 9 8 5 5 3 0