In terms of fonts, the hard pen, like the brush, is roughly a seal script, and of course it also includes other subclasses. Seal script generally refers to small seal script, including big seal script, as well as early fonts such as Oracle Bone Inscriptions and inscriptions. Grass mainly refers to today's grass, of course, including Cao Zhang. Running script is a kind of calligraphy between running script and cursive script. Most of the words written by the leaders you mentioned are cursive, which is the most practical font for handwriting, beautiful, fast and easy to read. If calligraphers are used to divide fonts, they can be called elegant, that is, the words of two kings, one is beautiful, and the other is Yu and Chu.