I introduced three purposes of reading. In this section, I introduce another purpose. It is to make materials for review. As we learned in (3.5) Spaced repetition method that lasts knowledge, it is important to repeat review at long intervals to make the long-term memory.

Do you remember the contents of the book you have read? If you don't remember, the time you spent reading the book was a waste.

Let's think about making materials for review.