What is the inscription of wisdom that Yang Xiu and Cao Cao are three miles short of?

Cao Cao and Yang Xiu rode horses together. When they passed the stone tablet of Cao E, they saw the words yellow silk, young woman, grandson and mortar engraved on it. Cao Cao asked Yang Xiu if he understood the meaning of these eight words. Yang Xiu was about to answer when Cao Cao said, "Don't say it yet, let me think." It was not until he had walked thirty miles that Cao Cao said, "I have understood the meaning of those eight words." Please tell me your understanding and see if our ideas are consistent. " Yang Xiu said: "Silk and Yang Xiu colored silk are also unique; Young women and girls are also better; Grandson is better for his daughter's son; The mortar is a device for receiving five symplectic words, and the word for receiving another symplectic word is qi (qi is the traditional Chinese character of words). These eight words are "wonderful words" and are a compliment to Cao E's inscription. " Cao Cao exclaimed, "Your talent and wisdom make me three miles away. "That's it. Give it to me.