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