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Generally speaking: for smaller characters, use pillow wrists; for slightly larger characters, use hanging wrists; for overly large characters, use hanging elbows.
Regular script is a common handwriting style in Chinese calligraphy, and it is the modern traditional Chinese handwriting style.
This style gradually evolved from the official script and became more simplified, horizontal and vertical. It can be divided into large regular script, medium regular script and small regular script. Ouyang Xun, Yan Zhenqing, Liu Gongquan and Zhao Meng are the four masters of Kai style.