The figure left shows how the 10 Heavenly Stems hide in Earthly Branches.

2 - 1 -2. The Process of Listing Four Pillars.
Now, let continue with the example that one person comes for a divination at the time of Wu (11:00AM - 1:00PM) soon after Yu Shui (TFSP02), we get the following Heavenly Disc:

We also know the date in Chinese lunar system is Jia-Zi (). The we first write down the first pillar as follows:

Jia, the first Heavenly Stem, hides in the position of Yin () in the unmovable Earthly Disc. But now the position of Yin () is occupied by , so we write down above , we get the following form:

Then we proceed to write down to the right side of :\

The position of in Earthly Disc is occupied by . So, we get the following form:

Then we proceed to write down the date branch of date.

The position of in Earthly Disc is occupied by .

Then write down to the right side of , we get the following:

The position of in Earthly Disc is occupied by .

In such way we get the Four Pillars.

In summary, we use the following figure to demonstrate the whole process: