code: def _retrieve_morpheus_entry(self, word):
          
          entry = self.macron_data.get(word)
          if entry is None:
              logger.info('No Morpheus entry found for {}.'.format(word))
              return None
          elif len(entry) == 0:
              logger.info('No Morpheus entry found for {}.'.format(word))
          return entry
docs: Return Morpheus entry for word
  
          Entry format: [(head word, tag, macronized form)]
  
          :param word: unmacronized, lowercased word
          :ptype word: string
          :return: Morpheus entry in tuples
          :rtype : list