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