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