input: def find_mode(numbers: List[int]) -> int:
      """
      Return the mode of the given set of values. The mode is the element that 
      appears most frequently in the list.
      >>> find_mode([1, 2, 3, 2, 4, 2])
      2
      >>> find_mode([1, 2, 3, 3, 3, 2])
      3
      """
output:     frequency = {}
      for num in numbers:
          if num in frequency:
              frequency[num] += 1
          else:
              frequency[num] = 1
      
      max_count = 0
      mode = None
      for num, count in frequency.items():
          if count > max_count:
              max_count = count
              mode = num
      
      return mode