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