Use the method used by the opponent to subdue the opponent

There is a passage in the story of Afanti: a BA Yi (rich man) was very unhappy when he heard that the villagers praised Afanti for his good dyeing, so he took a piece of cloth to make trouble for Afanti. He said to Avanti, "the color I want to dye is very common. It's not red, not blue, not black, not white, not green, not green. (don't dye it into any color in fact) do you understand?" Afanti promised with confidence: "no problem, I will dye it according to your idea." Bayi was very surprised: "what, can you dye it? Do you mean what you say? When can I pick it up? " Avanti said, "come and get it on that day." Bayi asked, "which day is that?" Avanti said: "that day is not Monday, not Tuesday, not Wednesday and Thursday, not Friday and Saturday, not even Sunday. Dear Lord Bayi, you can come to "that day" to get it Bayi was stunned.

It's not any specific color that can't be dyed. If Afanti says it can't be dyed, he will be ridiculed by Bayi. If he talks with such unreasonable people, he will be entangled. So he treated him in his own way. He asked Bayi to take cloth on a date that was not a specific date. He left Bayi's problems to him to solve, which made him ask for nothing.