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