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