How to loop through an list(CDT) and print its indexes in a grid?...

There are several examples in the documentation. Take a look at each of them to see which will help you with your requirement, there's no better way to come up with an idea than reviewing the documentation and testing.

There are several examples in the documentation. Take a look at each of them to see which will help you with your requirement, there's no better way to come up with an idea than reviewing the documentation and testing.