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What does it mean to thank Guo Jia first?

Cao Cao defeated Yuan Shao, decided to Liaodong and formed Qingzhou Army. The situation is excellent, and there is a faint trend of winning the world. He wants to make a speech. Yu Xun was afraid that Cao Cao was too conceited, so he immediately handed him a secret kit for Cao Cao to open when he was talking. On that day, Cao Cao came to power and opened his kit, which read five words: Fuck, thank Guo Jia first!