When King Wen went to prison, he overlapped the gossip into sixty-four hexagrams.
The duke of Zhou was rude.
Confucius wrote ten papers, including Yi Zhuan, called Ten Wings. Eight diagrams, Yi Ci and Ten Wings add up to the Book of Changes.
Some people say that the Book of Changes is the product of several civilizations.
Of course, these are legends, beyond reproach!
But one thing is certain, that is, the Book of Changes was created with the wisdom of all people.
Now it is called Zhouyi, Xia Yi is called Lianshan Yi, and Shang Yi is called Gui Zang Yi. Some people say that these two books are lost. I think the word Zhou not only has the meaning of Zhou Dynasty, but also has the meaning of perfection. Confucius is good at drawing inferences from others. Maybe he hid them both in Zhouyi, waiting for you to explore and develop them, haha. ...
The "iron plate gods" of the five great gods used Lianshan Yi and Guizang Yi, so it can be seen that they have not all been lost.
It's a bit far-fetched, but your question is clear.