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