7
0 23 23 20 14 18 19 
23 0 12 9 13 9 8 
23 12 0 7 15 9 8 
20 9 7 0 10 4 3 
14 13 15 10 0 10 7 
18 9 9 4 10 0 3 
19 8 8 3 7 3 0