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
시네틱스는 창의적인 문제 해결을 촉진하는 방법입니다.sinetikseun chang-uijeog-in munje haegyeol-eul chogjin-haneun bangbeob-imnida.Synectics is a method that promotes creative problem solving.