code: def test_get_text_index_string_multiple_words(self):
      bigram_string = self.tagger.get_text_index_string(
          "Hello Dr. Salazar. How are you today?"
      )
  
      self.assertEqual(bigram_string, "INTJ:salazar PROPN:today")
  
imports: from unittest import TestCase
  from chatterbot import languages
  from chatterbot import tagging
label_desc: Use image node_id 17 for calling the PosLemmaTaggerTests obj's underlying member method code with example usage: obj.test_get_text_index_string_multiple_words() without return types