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Functional-1 > lower
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Given a list of strings, return a list where each string is converted to lower case (Note: String toLowerCase() method).

lower(["Hello", "Hi"]) → ["hello", "hi"]
lower(["AAA", "BBB", "ccc"]) → ["aaa", "bbb", "ccc"]
lower(["KitteN", "ChocolaTE"]) → ["kitten", "chocolate"]

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

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