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