https://blog.gongquiz.com/2020/10/06/halon-1301-halon-1211-halon-2402-%ec%a4%91-%ec%83%81%ec%98%a8-%ec%83%81%ec%95%95%ec%97%90%ec%84%9c-%ec%95%a1%ec%b2%b4%ec%83%81-%ec%9c%84%ed%97%98%eb%ac%bc%ec%82%b0%ec%97%85%ea%b8%b0%ec%82%ac/