7
0 28 25 22 16 19 19 
28 0 15 12 16 13 13 
25 15 0 7 17 10 10 
22 12 7 0 12 5 5 
16 16 17 12 0 11 7 
19 13 10 5 11 0 4 
19 13 10 5 7 4 0