How to deal with multiple selected checkboxes of the Active Choices Plugin in a script?

Is there a way to use independently the outputs of a checkbox list in the Active Choices plugin on Jenkins ? (as in my example, I need to access to the selected check boxes one at a time

Here are a few screens to explain my problem :

Active Choices configuration in the job

The script

Checkboxes selected

Output

I would like to be able to access first to only the Debian_6, then only the Debian 6 32bits :)

Thanks !