7
0 22 23 21 14 19 19 
22 0 9 7 12 7 7 
23 9 0 6 13 8 8 
21 7 6 0 9 4 4 
14 12 13 9 0 9 5 
19 7 8 4 9 0 4 
19 7 8 4 5 4 0