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