Yi Lin**

General comments: As an ancient book, there are useful idiosyncrasies for self-research, but the fallacies in the book's "additions and deletions" have been exhausted. Detailed comments: Due to my hobbies of use, I specialize in reading about lost marriages, illness, etc. The general introduction in the first chapter has reference value, such as the theory of mutual hexagrams (I have not studied the hexagrams in depth). The classification in the last three chapters is too detailed, so that the number of water characters is average, and the remaining chapters are not useful in modern times.

I think it's okay