Notice of two things.

First, I temporarily got off the construction site today. There was no Internet in the hotel. I wrote a chapter with a notebook. I used the card reader to transfer it to my mobile phone, and tried to send an email to my wife and asked her to send it. As a result, it was not displayed on my mobile phone. After studying for two hours, I was I really can't update it. I'll figure it out tomorrow. Second, a friend asked me when the book would be finished. It was originally planned to be written around August, but now it has become uncertain for some reasons. I will tell you when it is settled. RQ