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