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