The first couplet made by Emperor Qianlong was "Yan Suochi Liu Tang", representing the five elements respectively. As a result, the two candidates who came to take the exam answered irrelevant questions and said goodbye. As a result, Gan Long made the person who left first become the champion, and the person who left later won the second place, because Gan Long thought that the person who left first knew better and knew that it was difficult to match this pair. "Liu Tang in the Swallow Lock Pool", this couplet should correspond to the fire, gold, water, earth and wood in the five elements, which is absolutely unparalleled. I remember many such couplets circulating among the people. Personally, I think the best is Ji Xiaolan's Gun Town Tower, which conforms to the five elements, not to mention rice.