code: def _set_suffix_links(self):
          '''
          Sets all suffix links in all nodes in this trie.
          '''
          self._suffix_links_set = True
          for current, parent in self.bfs():
              if parent is None:
                  continue
              current.longest_prefix = parent.longest_prefix
              if parent.has_value:
                  current.longest_prefix = parent
              if current.has_suffix:
                  continue
              suffix = parent
              while True:
                  if not suffix.has_suffix:
                      current.suffix = self.root
                      break
                  else:
                      suffix = suffix.suffix
                  if current.uplink in suffix:
                      current.suffix = suffix[current.uplink]
                      break
              suffix = current.suffix
              while not suffix.has_value and suffix.has_suffix:
                  suffix = suffix.suffix
              if suffix.has_value:
                  current.dict_suffix = suffix