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In fact, these three schools belong to rational style. In principle, the three-in-one school is better, but it is not easy to learn, followed by Yang Zhai San Zhai and Ba Zhai, which are the easiest and entry-level learning. But now there is another school, which is widely used and has both form and spirit, and its practical application effect is very good and ideal, that is, the theory of Xuan Kong Fei Xing, which belongs to the principle of three-dimensional qi regulation. I recommend you to study in this school.