What does the song in the preface of the Book of Changes mean?

It's just that the order of the hexagrams is meaningless. Zhu added several conjunctions to facilitate reading and memory. If you are not a professional fortune teller, just look it up when you use it.

Gan Kun Tunmeng needs a lawyer. He is humbler than a small animal, and his colleagues are more prepared. He watched and ate, and peeled off the big animals, which were bigger than a hurdle and thirty preparations.

Xianheng fled and became strong, and Jin and his family were in full view, so he solved the profit and loss, rose to the trapped well, shook the tripod, and gradually returned to his sister's abundant travel, which made him happy, but he was younger than Ji Ji, and it didn't help. For the next 34 years.