code: def root_hypernyms(self):
          
          visited = set()
          hypernyms_next_level = set(self.hypernyms())
          current_hypernyms = set(hypernyms_next_level)
  
          while len(hypernyms_next_level) > 0:
              current_hypernyms = set(hypernyms_next_level)
              hypernyms_next_level = set()
            
              for synset in current_hypernyms:
                  if synset in visited:
                      continue
                  visited.add(synset)
                  hypernyms_next_level |= set(synset.hypernyms())
  
          return list(current_hypernyms)
docs: Retrieves all the root hypernyms.
          
          Returns
          -------
            list of Synsets
          Roots via hypernymy relation.