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