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