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