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The Zhouyi qi meng yi zhuan by Hu Yi-Gui, of the early Yuan Dynasty, can be divided into Nei pian and Wai pian in accordance with properties. Nei pian interpreted the Yi-ology and Wai pian the figure-ology. The classification of Zhouyi qi meng yi zhuan can be regarded as a ring of the blend of the figure-ology and Confucianism of the Sung and Yuan dynasties. Hu Yi-Gui not only pointed out that Yi wei, Jingshi yi zhuan, and Long hu jing were the far-fetched works of the later generations but also questioned about other figure-ology classics, which was agreed by most of the scholars of the Ming and Qing dynasties. Wai pian kept the version the same with that of the Tang and Sung dynasties and was quite contributive to the figure-ology literatures. Wai pian recorded eleven figure-ology classics, which were classified into four types, i.e., divination, dan tao, imitation of Zhouyi, and diagram, by the writer of this study. There were five books belonging to divination, including Yi wei, Jiao shi yi lin, Jing shi yi zhuan, Guo shi dong lin and Wei shi yuan bao. Zhou yi can tong qi and Long hu jing fell into the category of dan tao and continued the universe model of Zhouyi’s dichotomy of yin and yang.
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