input: from typing import List
  
  def delete_duplicates(numbers: List[int]) -> List[int]:
      """Delete all duplicates in a given list of numbers.
      >>> delete_duplicates([1, 2, 2, 3, 4, 4, 5])
      [1, 2, 3, 4, 5]
      >>> delete_duplicates([1, 1, 1, 1])
      [1]
      """
      final_list = []
      for num in numbers:
          if num not in final_list:
              final_list.append(num)
      return final_list
output:     final_list = []
      for num in numbers:
          if num not in final_list:
              final_list.append(num)
      return final_list