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