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