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