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