input: def removeDuplicates(array):
      """
      Remove duplicates from a list using built-in functions.
      >>> removeDuplicates([1, 2, 3, 4, 2, 3, 1])
      [1, 2, 3, 4]
      >>> removeDuplicates(['a', 'b', 'c', 'b', 'a'])
      ['a', 'b', 'c']
      """
output:     return list(dict.fromkeys(array))