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