Zhang, the prime minister of the Qing Dynasty, and Ye, the assistant minister, were both from Tongcheng, Anhui. The two families live next door and both want to build a house. There is an argument about land. Mrs. Zhang wrote in Beijing, asking Prime Minister Zhang to intervene. Unexpectedly, after reading the letter, the prime minister immediately wrote a poem to persuade the old lady: "It's just for the wall to pick a book a thousand miles away. Why not let it walk three feet?" The Great Wall of Wan Li is still there today, but I haven't seen Qin Shihuang. "Mrs. Zhang saw that the book was right and immediately took the initiative to retreat the wall by three feet. Ye Jia was deeply ashamed to see this scene, and immediately put the wall back three feet. In this way, a six-foot-wide roadway was formed between Zhang Ye's house and the courtyard wall of Zhang Ye's house, which became a famous six-foot alley.