Is "unvalidate' a thing?

I have a five pack subscription. 3 of the four validated domains are no longer being used. Do I 'lock' and 'archive' them? Does that release the validation for another domain?
Just asking before it happens...rather than after..

Thanks

Hi stanbush,

We can switch an unused domain for a new domain if you send both of them to us along with your sale id using the Contact Us menu.

Bob

Thanks...
I don't know if it will actually happen... but at least now I know!