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During the Warring States period, the philosopher Zhuangzi spoke of four friends, Zisi, Zixing, Zili, and Zilai. He said: "Who can take nothingness as the head, existence as the spine, death as the buttocks, and understand that life, death, survival, and extinction are all one, can become a friend?"
The four looked at each other and smiled, feeling a profound mutual understanding in their hearts, and thus became close friends.