code: def __hash__(self) -> int:
      return hash((self.etype, self.rtype, tuple(self.children)))
  
imports: from abc import ABC, abstractmethod
  from collections import deque
  from copy import deepcopy
  from enum import IntEnum, auto, unique
  from typing import Any
label_desc: Use image node_id 11 for calling the AbstractExpression obj's underlying member method code with example usage: obj.__hash__() and returns: hash