code: def unique_ids(self) -> List[str]:
      seen = set()
      seen_add = seen.add
      return [
          feature.id
          for feature in self._geocoded_features
          if not (feature.id in seen or seen_add(feature.id))
      ]
  
imports: import enum
  from abc import abstractmethod
  from collections.abc import Iterable
  from typing import List, Optional, Union, Dict
  from pandas import DataFrame, Series
  from lets_plot.geo_data_internals.constants import DF_COLUMN_HIGHLIGHTS, DF_COLUMN_COUNTRY, DF_COLUMN_STATE, DF_COLUMN_COUNTY, DF_COLUMN_CITY, DF_COLUMN_ID, DF_COLUMN_FOUND_NAME, DF_COLUMN_POSITION, DF_COLUMN_LIMIT, DF_COLUMN_CENTROID
  from .gis.geocoding_service import GeocodingService
  from .gis.request import PayloadKind, RequestBuilder, RequestKind, MapRegion, RegionQuery
  from .gis.response import Answer, GeocodedFeature, Namesake, AmbiguousFeature, LevelKind
  from .gis.response import SuccessResponse, Response, AmbiguousResponse, ErrorResponse
  from .type_assertion import assert_type, assert_list_type
label_desc: Use image node_id 6 for calling the Geocodes obj's underlying member method code with example usage: obj.unique_ids() and returns: unknown