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