7
0 25 25 22 15 19 19 
25 0 12 9 14 10 10 
25 12 0 7 16 10 10 
22 9 7 0 11 5 5 
15 14 16 11 0 10 6 
19 10 10 5 10 0 4 
19 10 10 5 6 4 0