input: 
  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_elements([5, 6, 7], [6, 7, 8])
      [6, 7]
      """
      return [element for element in list1 if element in list2]
  
output:     return [element for element in list1 if element in list2]