7
0 29 26 22 17 21 21 
29 0 13 13 16 12 12 
26 13 0 8 15 9 9 
22 13 8 0 13 7 7 
17 16 15 13 0 10 6 
21 12 9 7 10 0 4 
21 12 9 7 6 4 0