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