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