Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
이 문제는 중첩된 조건이 많아서 해결하기 어렵다.I munjeneun jungcheopdoen jogeoni manhaseo haegyeolhagi eoryeopda.This problem is difficult to solve because it has many overlapping conditions.