input: 
  from typing import List
  
  
  def common_elements(list1: List[int], list2: List[int]) -> List[int]:
      """ Takes two lists as input and returns a new list containing only the common elements.
      >>> common_elements([1, 2, 3, 4, 8], [2, 6, 8, 10])
      [2, 8]
      """
      common_list = [element for element in list1 if element in list2]
      return common_list
  
output:     common_list = list(set(common_list))
      return common_list