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