The law of eight diagrams in Zhouyi (it seems that there are seven situations) and how to find hexagrams.

Six hexagrams remain unchanged, and the word is broken by this;

A stubborn change, use this stubborn change to drop the word;

There are two changes, which are broken by the two words of this hexagram, but the above is the main one;

Three changes, changing with the original; This hexagram is chastity (body) and changed to regret (use);

Four changes, two unchanged, but the following is the main;

Five changes, unchanged mentality;

Six ideas are changed, and the two ideas of Gan Kun are broken with the word "use".