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Rang Fu was a man from the time of Emperor Yao. During the reign of Emperor Yao, the world was in perfect harmony, and the common people had no troubles.
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Shan Juan was a worthy man of antiquity. Emperor Yao heard that he had attained the Dao and thus faced north to study under him as a teacher. After Yao completed his reign, Shun also offered to yield the world to Shan Juan.