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