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