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