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"Yi Yin" can be called the pinnacle of the study of Zhouyi and prediction. This book cleverly uses the numerical change principles of innate numbers, Bagua Eight Palaces and Bagua Nine Palaces. It pioneered the technique of multiple judgments in one form, revolutionized the method of six relatives, and was able to distinguish the authenticity of six relatives. It explained in detail the specific application of the rising and falling lines of the twelve hexagrams through examples. The book also comprehensively discusses the methods of predicting the five elements and five tones, paying special attention to the hexagrams of the Great Yi. It deeply analyzes the inside and outside of the hexagrams, the mutual transformation relationship, and the secret of the easy judgment of the combination of the hexagrams and palaces. It is actually the supreme classic in the field of prediction of the six-line hexagrams of the Yi.