What are the bases of the four geomantic games in the cemetery?

The trinity water law of poverty alleviation in Yang Gong has four functions: fire, water and Jin Mu, which are determined by the four outlets (tombs) of "guarding ugliness" and do not involve Longshan. In other words, Yang Gong's "three-in-one water method" is determined by the water outlet. Prior to this, as long as the "vein" and "acupoint" are determined, it must be determined by the water outlet.