https://namu.wiki/w/%EC%BF%A0%ED%82%A4%EB%9F%B0:%20%EC%98%A4%EB%B8%90%EB%B8%8C%EB%A0%88%EC%9D%B4%ED%81%AC/%EB%A7%88%EB%B2%95%EC%82%AC%ED%83%95#s-4.3 이거 참고행!