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