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