7
0 21 22 17 12 17 16 
21 0 11 10 13 8 9 
22 11 0 7 14 7 8 
17 10 7 0 11 4 5 
12 13 14 11 0 9 6 
17 8 7 4 9 0 3 
16 9 8 5 6 3 0