input: 
  def generate_even_numbers(limit: int) -> List[int]:
      """ Generate a list of even numbers within the given range using list comprehensions.
      >>> generate_even_numbers(21)
      [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
      >>> generate_even_numbers(10)
      [2, 4, 6, 8]
      """
  
output:     return [x for x in range(2, limit + 1, 2)]