code: def _get_string_and_set_width(self, combination, mode):
          
          show = "{}".format(self._separator(mode)).join(combination)
          show = show.rstrip("{}".format(self._separator(mode)))
          self.max_width = max([self.max_width, len(show)])
          return show
docs: Construct the string to be displayed and record the max width.