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11 = 11-1-1=912 = 12-1-2=913 = 13-1-3=9..........20 = 20-2-0=1821 = 21-2-1=18......30 = 30-3-0=2731 = 31-3-1=27.....
смотрим под числами 9,18,27,36,45...
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