7
0 22 22 17 15 16 17 
22 0 8 9 9 8 7 
22 8 0 7 11 8 7 
17 9 7 0 10 7 6 
15 9 11 10 0 7 4 
16 8 8 7 7 0 3 
17 7 7 6 4 3 0