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