input: def remove_duplicates(input: List[int]) -> List[int]:
      """ Removes duplicate entries from a list.
      >>> remove_duplicates([1, 2, 2, 3, 3, 4])
      [1, 2, 3, 4]
      >>> remove_duplicates([5, 5, 5, 5])
      [5]
      """
      final_list = []
      for num in input:
          if num not in final_list:
              final_list.append(num)
      return final_list
output:     final_list = []
      for num in input:
          if num not in final_list:
              final_list.append(num)
      return final_list