How can Lv Zuling be divided into upper, middle and lower levels?

The explanation of how Lv Zuling was divided into upper, middle and lower levels is as follows.

It is the fusion of Buddhist culture and local culture, and the interpretation of divinatory symbols with Buddhist wisdom. Lv Zu Lingqian is not so much a divination book as a prediction of the future situation by Buddhist wisdom, and it has some truth. Plant "good cause", why not "good result"! "Signs are divided into upper, middle and lower grades, and each grade is divided into upper, middle and lower grades. * * * Nine grades: Kyrgyzstan, Shanghai, China and Shanghai; There are three kinds of bad luck, upper middle, middle middle and lower middle; There are three kinds of fierceness, up, down and down. Please help me understand one. Before Lv Zuling, No.46 signed Wuji Shangji, and No.96 signed Guiji Shangji. I asked Lv Zu for a spiritual symbol, but I don't know what it means. I want to ask someone to help me. Wait online! You are not bad this year, but now something may happen.