https://blog.gongquiz.com/2022/08/01/%ed%8a%b8%eb%9e%98%ed%94%bd-%eb%8b%a8%ec%9c%84%ec%97%90%ec%84%9c-180hcs%eb%8a%94-%eb%aa%87-%ec%96%bc%eb%9e%91erlang%ec%9d%b8%ea%b0%80-%ec%a0%95%eb%b3%b4%ed%86%b5%ec%8b%a0%ea%b8%b0%ec%82%ac-202/