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Lie Yukou was a representative figure of Daoism in the early Warring States period. He is also known as Yu Kou, Yu Kou, or Liezi. Traditionally believed to be from the state of Zheng (in present-day Zhengzhou, Henan) during the Warring States era, he advocated the principles of emptiness, stillness, and non-action (wu wei),…