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