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