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