In the divination of the Book of Changes, there will be four divination numbers of 6, 7, 8 and 9. Among them, the even numbers of 6 and 8 are yin, and the odd numbers of 7 and 9 are yang; And 7 and 8 belong to the same, because 7 rises to 9, or it belongs to Yang; Eight is yin, which can be returned to six, and it is still yin, so there are seven cases.
In addition, the numbers 9 and 6 belong to the change of mind, which coincides with the yin of the anode and the yang of the cathode, while the Yijing divination just takes the change of mind. . . Don't start talking.