What is the predecessor of the Book of Changes? What is the name of the most primitive divination book?

There is a saying in the San Zi Jing: There are mountains, and there are Tibetans. There are details of Zhouyi and Sanyi.

Lianshan, Guizang and Zhouyi are three ancient books of China, which are collectively called "Three Changes", and "Three Changes" are books that explain the cyclic changes of the universe in the form of hexagrams. The ancients said that summer, mountains are connected, commerce, Tibetan return, Zhou Yueyi. There are different explanations for this in the past dynasties. Some say that the prediction thought of Yi divination has different manifestations in the historical development, that is, the process from simplicity to complexity, while others say that the same divination has different names in different times.