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