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