7
0 31 27 23 19 22 22 
31 0 14 14 16 13 13 
27 14 0 8 16 9 9 
23 14 8 0 14 7 7 
19 16 16 14 0 11 7 
22 13 9 7 11 0 4 
22 13 9 7 7 4 0