They are all from Li Yongle, which is a big topic in the world. The ideas of explaining knowledge points in the line generation part of the two books are similar. The topic is different, but it is still the same. His style is a fixed routine and will not change much because of the change of the book. To put it bluntly, it is similar. Personally, line generation is the best part of the three small branches. After reading the line generation of the whole book, it is enough to do the problem. It's a bit unnecessary to buy an independent book. Hope to adopt.