How to judge the combination of key and dynamic?

Scientific determination of key dynamic factors. The theme is Old Yin and Lao Yang, which represents the change of things. If there is a motif in the hexagrams, you must pay attention. The movement of things is the internal cause of things' changes. By applying this law to six-hexagram fortune-telling, we can deduce the change information of the measured things. The dynamic change law of divinatory symbols is mutual change of yin and yang, that is to say, yin enters yang and yang enters yin. All judgments should be based on science.