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"Etymology" is a monograph on word theory written by Zhang Yan in the late Song Dynasty and early Yuan Dynasty. At that time, the Song Dynasty died, and Zhang Yan's life experience was ups and downs, so he wrote this book while wandering. The book analyzes the five tones and twelve temperaments, the rhythm and the sound, and the palace tone and color, and analyzes the essence and principles, covering chapters such as composition, syntax, and clearing. It is a classic in the field of Ci poetry and has a profound influence on later generations.