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