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