code: def register_entity(self, entity_value, entity_type, alias_of=None):
          
          if alias_of:
              self.trie.insert(entity_value.lower(), data=(alias_of, entity_type))
          else:
              self.trie.insert(entity_value.lower(), data=(entity_value, entity_type))
              self.trie.insert(entity_type.lower(), data=(entity_type, 'Concept'))
docs: Register an entity to be tagged in potential parse results
  
          Args:
              entity_value(str): the value/proper name of an entity instance (Ex: "The Big Bang Theory")
              entity_type(str): the type/tag of an entity instance (Ex: "Television Show")