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