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