this is the code i wrote. numbers = [5, 2, 555, 7, 111, 7, 2, 111, 2, 2, 5, 5] for num in numbers: if numbers.count(num) > 1: numbers.remove(num) print(numbers) the result was: [555, 111, 7, 111, 2, 2, 5] What is wrong with this code? Thanks in advance.