About the duplication of 168 and 169, I'm very sorry, this is a keyboard mistake, it has been modified just now, I heard from other authors, but book friends who have subscribed, need to delete the book from the bookshelf, and then add it back to the shelf. Book friends who didn't subscribe just now, now directly subscribe to the revised chapters, the inconvenience caused to all book friends, the keyboard apologizes here! (To be continued......)