https://blog.gongquiz.com/2021/05/05/%ed%8e%8c%ed%94%84%ec%97%90%ec%84%9c-%ec%9c%a0%eb%9f%89%ec%9d%84-qm3-min-%ec%96%91%ec%a0%95%ec%9d%84-hm-%ed%9a%8c%ec%a0%84%ec%88%98-nrpm%ec%9d%b4%eb%9d%bc-%ed%95%a0-%eb%95%8c-1%eb%8b%a8-%ed%8e%8c/