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Functional-1 > copies3
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Given a list of strings, return a list where each string is replaced by 3 copies of the string concatenated together.

copies3(["a", "bb", "ccc"]) → ["aaa", "bbbbbb", "ccccccccc"]
copies3(["24", "a", ""]) → ["242424", "aaa", ""]
copies3(["hello", "there"]) → ["hellohellohello", "theretherethere"]

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public List<String> copies3(List<String> strings) { }

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