7
0 22 23 20 12 16 17 
22 0 11 8 14 10 9 
23 11 0 7 15 9 8 
20 8 7 0 10 4 3 
12 14 15 10 0 10 7 
16 10 9 4 10 0 3 
17 9 8 3 7 3 0