code: def get_pub_place(self, undefined=""):
          
          places = set([
              remove_hairs_fn(place)
              for place in self["260a  "] + self["264a"]
          ])
  
          return _undefined_pattern(
              ", ".join(places),
              lambda x: x.strip() == "",
              undefined
          )
docs: Args:
              undefined (optional): Argument, which will be returned if the
                        `pub_place` record is not found.
  
          Returns:
              str: Name of city/country where the book was published or \
                   `undefined` if `pub_place` is not found.