![image-20230816145833671](assets/image-20230816145833671.png)

![image-20230816145844068](assets/image-20230816145844068.png)

![image-20230816145853300](assets/image-20230816145853300.png)

单纯网：没有自旋

简单网：没有环

![image-20230816153747750](assets/image-20230816153747750.png)