Some problems about elephants in the Book of Changes

The so-called "Ying" is very simple. There are six hexagrams in the Book of Changes, among which one hexagram and four hexagrams, two hexagrams and five hexagrams, and three hexagrams and three hexagrams are corresponding. However, there is a problem. In order to correspond, there must be one condition, that is, the first and fourth hexagrams, the second and fifth hexagrams, and the third hexagram and the above hexagrams must be opposite. This is a correspondence. This is the corresponding concept. Let me explain the communication to you in vernacular. Maybe you can understand, with the help of others.

The so-called ratio, let's give an example, two hexagrams, two hexagrams, one hexagram and three hexagrams in Zhouyi have a ratio relationship, in other words, there is a ratio relationship between one hexagram and his related two hexagrams. For example, between the second and the first three, between the third and the second four, between the fourth and the third five, between the fifth and the fourth.