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Python provides a method to create a unique set of unordered items with no duplicates. The main use case for sets is for checking is an item exists in a set of items, which can be useful in many different situations. You can also create sets from strings, using the same `set()` function: 'set()' and 'frozenset' function. We can combine two sets into one using the `|` operator: 'Set' or 'set' is a set that contains items found in either `Set or `Set`.