Solve from a logical point of view:
Tongshan: refers to a mountain without vegetation. Of course, there is no anger, which may be harmful to those who sacrifice to sweep.
Broken mountain: The mountain has been dug. In ancient times, taking stones to build houses, the mountains have been extinct, and taking stones over the years will endanger the yin house.
Dushan: There is only one mountain. In the same way, of course, it is the only way to take the stone.
Crossing the mountain: two mountains cross the gorge. Of course, it is a shortcut to climb the mountain. If you take the road through the mountains, it will also endanger the secluded house.
Shishan: Of course, on the one hand, it takes labor to dig up. On the other hand, from the time point of view, it is possible to take a stone mountain after taking a stone nearby, and it is more likely to take a special stone, such as granite. Of course, the nearest rocky mountain is more likely, and it is also an isolated mountain.
Therefore, the ancients concluded that "breaking the stone alone" means considering priorities from the perspective of the living and the buried. Tongshan is the most important to the living, and breaking it is the second most dangerous in reality. Dushan is the third inevitable hazard, climbing mountains is the fourth possible hazard, and rocky mountains are the last one with the least possibility.
"Branch" branch