With this application, you can create books. And in these books you can create cards which you can write something for one side something for other side. Than later you can look at the front side of the cards and guess what is in the back
9Apps 4.9
![국세청 홈택스 [손택스] on 9Apps](https://go.getnew.app/sg/res/jpg/f7/df/69cc2f90120ec331db2630e0f5b6-6dh.jpg?x-oss-process=style/jmq200)
