You can write the formula of the correspondence included in this process. The processed K-line only shows the highest price and the lowest price. The following figure shows the inclusion relation of K-line after processing, white K-line indicates the inclusion relation between K-lines, magenta indicates the upward trend of K-line without inclusion relation, blue indicates the downward trend of K-line without inclusion relation, yellow indicates the upward trend of K-line after processing, and green indicates the downward trend of K-line after processing. Because the white K-line may block the processed yellow K-line and green K-line, draw two processed horizontal lines of the highest price and the lowest price. The yellow horizontal line is the highest and lowest price position of all K-lines containing the upward trend, and the green horizontal line is the highest and lowest price position of all K-lines containing the relationship.

However, there will be many special situations when dealing with inclusion relations, and the conditions for dealing with these special situations, such as continuous inclusion, need to be dealt with. Maybe everyone's conditions are unreasonable and the formula results are different.