7
0 26 27 22 18 22 22 
26 0 11 10 12 8 8 
27 11 0 9 15 9 9 
22 10 9 0 12 6 6 
18 12 15 12 0 10 6 
22 8 9 6 10 0 4 
22 8 9 6 6 4 0