Automation - Applying Conditional Formatting To Group Of Cells In Loop?

So I would like to automate the following, as doing it by hand takes a lot of time. I have searched the whole internet and finished empty handed.

Start from cell E10
Select cell
Move 3 cells down
Select cell
Move 3 cells down
Select cell
Move 3 cells down
Select cell
Move 3 cells down
Select cell
Move 3 cells down
Select cell
Move 3 cells down
Select cell
Apply double entry conditional formatting
Move 3 cells down
Repeat above until cell E5000