*) Due to my poor memory, it is necessary to always save some code that reflects my thinking process. These codes may be better replaced in later work, or he may be wrong at the beginning, so I must put They commented out, in order to distinguish some other normal explanatory notes, it is necessary to add some special tags
# "" "#Next, determine whether the node in the abutment is in the adjacency list of the starting node. If a ring is found in the description," "" is annotated with the # sign first, followed by the text note, and then the # sign Branch notes
