Yan Liujin Gu Yan: Yan Zhenqing, a calligrapher in the Tang Dynasty; Liu: Liu Gongquan, a calligrapher in the Tang Dynasty. Yan Liu's and Yan Liu's calligraphy are both powerful, but their styles are different. Also known as excellent calligraphy.
Yan Gu means that both kinds of calligraphy are very powerful, but their styles are different. Also known as excellent calligraphy. Same as Yan Gu.