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