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Iterables and IteratorsProblem link : https://www.hackerrank.com/challenges/iterables-and-iterators/problemDifficulty : Medium TipAs we can see from problem description, it's regarding combinationWe might be confused a bit due to that 'a' is appeared only once, or multipleIf 'a' appeared only once, we can resolve it simplyHowever, a appeared in multiple timeswe should generate all combinationand..