7
0 22 21 17 13 16 16 
22 0 11 9 11 8 8 
21 11 0 8 16 9 9 
17 9 8 0 12 5 5 
13 11 16 12 0 11 7 
16 8 9 5 11 0 4 
16 8 9 5 7 4 0