docs: def get_chunks(self,chunk_type):
          """
          Returns the chunks for a certain type
          @type chunk_type: string
          @param chunk_type: type of the chunk
          @rtype: list
          @return: the chunks for that type
          """
          for nonter,this_type in self.label_for_nonter.items():
              if this_type == chunk_type:
                  subsumed = self.terms_subsumed_by_nonter.get(nonter)
                  if subsumed is not None:
                      yield sorted(list(subsumed))