https://blog.gongquiz.com/2022/06/30/%ed%95%ad%ea%b3%b5%ea%b8%b0-%eb%82%a0%ea%b0%9c-%eb%b6%80%ec%9c%84-%ec%a4%91-%eb%a6%ac%eb%94%a9%ec%97%90%ec%a7%80leading-edge%ec%97%90-%eb%b0%9c%ec%83%9d%ed%95%98%eb%8a%94-%eb%b9%99%ea%b2%b0%ec%9d%84/