20
11 12 20 15 13 16 19 18 14 17 
11 16 14 18 20 19 17 15 13 12 
15 18 17 20 19 11 16 12 14 13 
13 14 18 11 16 12 15 20 17 19 
19 14 20 11 17 15 12 13 18 16 
11 12 18 16 20 14 13 19 17 15 
18 14 16 13 19 11 17 12 15 20 
14 17 20 19 16 13 12 15 18 11 
11 14 17 20 18 16 13 19 12 15 
15 16 14 11 13 12 18 19 20 17 
5 1 10 8 9 7 4 2 6 3 
1 9 3 8 6 2 4 5 10 7 
6 4 2 9 7 1 5 3 8 10 
1 8 2 6 7 4 10 5 3 9 
5 4 3 10 6 9 2 8 1 7 
9 3 6 7 1 4 2 5 8 10 
8 4 9 1 10 7 2 6 3 5 
3 10 6 9 2 4 7 5 8 1 
3 2 1 6 8 4 10 5 7 9 
1 8 5 6 3 7 10 2 4 9 
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forbidden 10 20