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