https://blog.gongquiz.com/2024/04/22/%eb%ac%bc%eb%a6%ac%ed%83%90%ec%82%ac%ec%97%90%ec%84%9c-%eb%84%90%eb%a6%ac-%ec%88%98%ed%96%89%eb%90%98%eb%8a%94-%ec%97%ad%ec%82%b0inversion%ec%97%90-%eb%8c%80%ed%95%9c-%ea%b0%80%ec%9e%a5-%ec%98%ac/