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