[oo_jazz_oo]

Ok, I am making a simple level ban system.
Now, I can add the string to the clientr.levelbans, but how do I remove a certain var from it?
So, when a staff says /ban oo_jazz_oo event_something.nw then that is added to clientr.levelbans.
When a staff says /unban oo_jazz_oo event_something.nw, how do I get that var from the clientr.levelbans and delete it?