What is Li Hongcheng's four-pillar thrust in the eight characters?

Eight-character (also known as four-column) backward inference refers to querying the existence of corresponding time points of known eight characters in a certain time range according to a known eight characters.

The function of four-column inversion is suitable for eight-character researchers and Yi-ology enthusiasts, and most people rarely use this function.

At present, many Zhouyi-related websites will provide this function, but the calculation time range of each website is different.

For example:

Known eight characters: ugly.

If you use the eight-character search of cinda numerology prediction tool network, you can find six time points, as shown in the following figure: