Nine turns to Gong Xuan, also known as the "89 Gong Xuan", is a teaching method. It is mentioned in the Romance of Gods that Yang Jian changed from nine to practice Yuan Gong, but from eight to nine to pure Yang. At the same time, there is an article entitled "Yuding Nine in West Sichuan turned to Dan", which is the source of this achievement, hence the name.
Introduction of six doors:
Six doors refers to the general name of the three law departments' yamen. The only entrance to the outer wall of Yamen is the gate on the south side of the central axis. This door is also called the "head door". It is not a simple doorway, but a building with a roof. This kind of curtilage door is a major feature of China architecture, and its shape is strictly restricted by law and etiquette.
No matter how big the county is, the gate can only be a three-bay (the bay on the front of the building, and the horizontal distance between two pillars is one). There are two black painted doors in each room, and there are always six doors, so the county government is often called "six doors". As the saying goes, "You can't get in without money", and the servants and bookkeepers in the yamen are also commonly known as "six activities".