How to dynamically close gaps within a table

Hello Experts,

I want to create a table with 3 columns.

Please see this example:
Example

What I want to acheive is the falling output:

->a ->b ->c
->d ->e ->f
->g ->h

If I then remove an element, I want the table to clean up.
Eg, if I remove "->e ":

->a ->b ->c
->d ->f
->g ->h

Is this possible with CSS. I want to be able to add/remove these elements at will and let the css 'tidy' up the table.

Thanks!