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