7
0 25 22 19 15 18 18 
25 0 11 10 12 9 9 
22 11 0 7 15 8 8 
19 10 7 0 12 5 5 
15 12 15 12 0 11 7 
18 9 8 5 11 0 4 
18 9 8 5 7 4 0