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