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