7
0 23 22 19 13 18 18 
23 0 11 10 14 9 9 
22 11 0 7 15 8 8 
19 10 7 0 12 5 5 
13 14 15 12 0 11 7 
18 9 8 5 11 0 4 
18 9 8 5 7 4 0