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