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