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