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