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