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