code: def unhumanize_class(my_classes):
      
      result = []
      interval = my_classes[-1] - my_classes[-2]
      min_value = 0
      for max_value in my_classes:
          result.append((format_decimal(interval, min_value),
                         format_decimal(interval, max_value)))
          min_value = max_value
      return result
docs: Return class as interval without formatting.