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