https://genesis-aka.net/language/japanese/2021/01/15/l-is-b%e3%81%ae%e3%80%8cai-faq%e3%83%9c%e3%83%83%e3%83%88%e3%80%8d%e3%81%ab%e6%96%b0%e6%a9%9f%e8%83%bd-%e3%83%81%e3%83%a3%e3%83%83%e3%83%88%e3%83%9c%e3%83%83%e3%83%88%e3%81%ab%e8%b3%aa%e5%95%8f/