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Define a function that when passed an array, returns true if it contains any item more than once, false otherwise. containsDuplicate([1, 7, 2, 9]) → false containsDuplicate([1, 7, -7, 2, 9]) → false containsDuplicate([0, 0, 0, 0, 0, 0, 0, 0, 0]) → true ...Save, Compile, Run (ctrl-enter)  | 
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Difficulty: 3 Post-solution available
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