👉 In computer science, a duplicate is an element in a sequence that appears more than once. For example, if you have a list of numbers and you want to find out which number appears twice, you can use the `set()` function from Python's `collections` module to convert the list into a set, then check if all elements are unique by comparing their values against each other. Here is an example in Python: ```python numbers = [1, 2, 3,
