Implement a SubsetGenerator that generates all subsets of the characters of a string. For example, the subsets

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Implement a SubsetGenerator that generates all subsets of the characters of a string. For example, the subsets of the characters of the string "rum" are the eight strings "rum", "ru", "rm", "r", "um", "u", "m", "" Note that the subsets don’t have to be substrings—for example, "rm" isn’t a substring of "rum".

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