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