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