class_docstr: Transforms the input sentence by adding a subordinate clause from WikiData.
  
  Example::
      original: "And it left mixed signals for London."
      transformed: "And it left mixed signals for London, which is a capital
          and largest city of the United Kingdom."
class_docstr_tok: ["Transforms","the","input","sentence","by","adding","a","subordinate","clause","from","WikiData",".","Example",":",":","original",":","``","And","it","left","mixed","signals","for","London",".","''","transformed",":","``","And","it","left","mixed","signals","for","London",",","which","is","a","capital","and","largest","city","of","the","United","Kingdom",".","''"]
code: def pop_list(self, entity_list, pop_set):
      for i in sorted(list(pop_set), reverse=True):
          entity_list.pop(i)
      return None
  
file_path: textflint/textflint/generation/transformation/DP/add_sub_tree.py
imports: import json
  import random
  import urllib.request
  from wikidata.client import Client
  from wikidata.entity import Entity, EntityId
  from ..transformation import Transformation
  from ....common.utils.error import FlintError
  from ....common.settings import WIKIDATA_STATEMENTS, CLAUSE_HEAD, WIKIDATA_INSTANCE
label_desc: Use image node_id 6 for calling the AddSubTree obj's underlying member method code with example usage: obj.pop_list(entity_list, pop_set) and returns: None