input: def removeDuplicates(input_list: List[int]) -> List[int]:
      """ Remove duplicate entries from a given list.
      >>> removeDuplicates([1, 2, 2, 3, 3, 4])
      [1, 2, 3, 4]
      """
output:     seen = set()
      result = []
      for item in input_list:
          if item not in seen:
              seen.add(item)
              result.append(item)
      return result