Meridian collision:
First: the uterus is stagnant, and the palace is hot at noon. Water can put out the fire. Therefore, it is called collision.
Second: in the opposite direction, rush. The son of the Lord is due north and lives in the south at noon. It's a long way. He's in a hurry.
The first premise is that water can put out the fire.
In the four pillars and eight characters, there are also signs that the ground branches are hidden, such as the water in the morning; Ding Huo was hidden in the middle, and Ding Huo was flooded, so they collided with each other. Wait a minute. Analogy.