1. Knot theory; A written job begins with a knot. (Late Qing Dynasty: Zhu Zonglai)
2. gossip; About sixty-four hexagrams in the Book of Changes are the ancestors of writing. (Song: Zheng Qiao)
3. Book deed (engraved deed); Carved symbols are one of the sources of Chinese characters. (Guo Moruo)
4. Cang Xie's word-making theory; During the Warring States and Han Dynasties, there were many works and they were widely circulated.
5. The picture says. Words are based on pictures, and the original words are pictures that can be understood (Tang Lan)