Why are there two out of six?

This question is a bit vague, based on the theory of single hexagram: three hexagrams are one hexagram, and six hexagrams naturally have two hexagrams; It is necessary to emphasize divination: there is a change of heart, one is the original divination, and the other is a change of heart. This is a common view.

If we use the viewpoint of {Li Yijing}, in addition to the exchange of the next hexagram and the stem of the upper hexagram, there are two branches hidden in it, namely, borrowing from the left, making friends with shoes, integrating family and friends, and making friends with colleagues in China and . How many hexagrams are these?