code: def extract_be_a_index(sentence):
      result = None
      if "is a" in sentence:
          result = sentence.index("is a")
      elif "are a" in sentence:
          result = sentence.index("are a")
      elif "was a" in sentence:
          result = sentence.index("was a")
      elif "were a" in sentence:
          result = sentence.index("were a")
      elif "be a" in sentence:
          result = sentence.index("be a")
      elif "is the" in sentence:
          result = sentence.index("is the")
      elif "are the" in sentence:
          result = sentence.index("are the")
      elif "was the" in sentence:
          result = sentence.index("was the")
      elif "were the" in sentence:
          result = sentence.index("were the")
      elif "be the" in sentence:
          result = sentence.index("be the")
  
      return result
  
imports: import logging
  import os
  import re
  import sys
  from nlp_architect.data.cdc_resources.data_types.wiki.wikipedia_page import WikipediaPage
  from nlp_architect.data.cdc_resources.data_types.wiki.wikipedia_page_extracted_relations import WikipediaPageExtractedRelations
  from nlp_architect.data.cdc_resources.wikipedia.wiki_search_page_result import WikipediaSearchPageResult
  from nlp_architect.utils.text import SpacyInstance
label_desc: Use image node_id 12 for calling the WikiOnline obj's underlying member method code with example usage: obj.extract_be_a_index(sentence) and returns: result