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