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