One-line, two-horizontal, three-body limbs Who created them?

"One-line, Two-horizontal and Three-body Limbs" is a sentence in Preface to Lanting Collection written by Wang Xizhi, an ancient Chinese calligrapher. Wang Xizhi was a famous calligrapher in the Eastern Jin Dynasty. His calligraphy works are regarded as "the best running script in the world", and his Preface to Lanting is regarded as a classic in the history of calligraphy in China, which has been widely praised and studied. Preface to Lanting Collection is one of Wang Xizhi's representative works and a classic in the history of calligraphy in China. Taking Lanting as the background, this paper describes the scene of Wang Xizhi drinking tea and painting with friends in Lanting, and expresses Wang Xizhi's unique views and feelings on nature, humanities and art.