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