Find all numbers that appear in both lists. The returned list should contain no duplicates. The order of numbers in the output does not matter.
Examples:
Input: list1 = [1, 2, 3, 4, 5], list2 = [4, 5, 6, 7, 8]
Output: [4, 5]
Input: list1 = [1, 2, 2, 3], list2 = [2, 2, 3, 4]
Output: [2, 3]
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