input: 
  def convert_list_to_dict(items: List[int]) -> Dict[int, str]:
      """ Converts a given list of integers into a dictionary where each integer is a key
      and its corresponding value is a string representation of that integer.
      >>> convert_list_to_dict([1, 2, 3, 4])
      {1: 'one', 2: 'two', 3: 'three', 4: 'four'}
      """
  
output:     
      result = {}
      for num in items:
          result[num] = {1: 'one', 2: 'two', 3: 'three', 4: 'four'}.get(num, 'unknown')
      return result
  