How to read the writing tips in Unit 8 of the first volume of the sixth grade Chinese?

The first volume of grade six, unit 8, Chinese, is a mysterious tower card written by Liu Gongquan. Liu Gongquan was a famous calligrapher in Tang Dynasty. His regular script, written by Fiona Fang, is angular and exquisitely structured. People often say that the "Liu Gu" of "Yan Gu" not only describes his fine, hard and straight calligraphy, but also has a strong skeleton. The tower card of Enigma is one of his representative works of regular script. Those who cross the ocean to save themselves on the other side must have a wonderful way to open June of the first year.