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