7
0 22 22 19 14 17 18 
22 0 12 9 12 9 8 
22 12 0 7 14 9 8 
19 9 7 0 9 4 3 
14 12 14 9 0 9 6 
17 9 9 4 9 0 3 
18 8 8 3 6 3 0