【Sticking to the Spring League, pay attention to the upper and lower links】
To distinguish between up and down, the key is to look at the last word. Couplets have always had the rule of "仄起平收", that is, the upper link tail word must be 仄声 (ancient up, go, into the three sounds), and the lower link tail word is "flat sound". For now, the last word of the upper link must be the upper sound and the desound, and the lower link is the end of the yin and yang ping characters. The attached picture of the spring link is posted wrongly, "companion" for the sound, the upper link, should be changed to the right side (from the outside to the door to see).
