There are Cao Zhang, Cao Jin and Crazy Grass. There are rules to follow in the changes of strokes, such as the urgent chapter of the Three Kingdoms Wu in Songjiang Edition. Today's grass is eclectic and fluent, and its representative works include Wang Xizhi's "The First Moon" and Jin Dynasty's "Getting Time". Mad grass appeared in the Tang Dynasty, represented by Zhang Xu and Huai Su, and its brushwork was wild and uninhibited, which became an artistic creation completely divorced from practicality. From then on, cursive script was only the works of calligraphers imitating Cao Zhang, Cao Jin and Kuangcao.
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