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