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