code: def word_literals(self):
          
          literals = []
          for word_synsets in self.synsets:
              word_literals = set()
              for synset in word_synsets:
                  for variant in synset.get(SYN_VARIANTS):
                      if LITERAL in variant:
                          word_literals.add(variant[LITERAL])
              literals.append(list(sorted(word_literals)))
          return literals
docs: The list of literals per word in ``words`` layer.