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