Zi Chou Tatsumi Xu Hai was arranged in twelve positions at noon, and his fingers turned in turn.
It is more complicated without a graph, and it is simple with a graph.
The index finger and the little finger are arranged under the third knuckle and the finger root, and the ring finger of the middle finger is arranged under the first knuckle and the finger root, which adds up to exactly twelve positions.
The first son is located under the ring finger root, clockwise, ugly under the middle finger root, and so on.
There are various relationships between these branches, so it is more convenient to see their relationships when they are in their hands. Such as opposition, and so on. I'm not sure.
You can also arrange eight letters.