I don't think they store three hashes though. Just the original one and they check against that. Only if that fails they proceed to verify other variants. There

I don't think they store three hashes though. Just the original one and they check against that. Only if that fails they proceed to verify other variants. There are only two - first letter uppercase (presumably for stupid phones) and inverse password (for caps lock on PCs). Both of these variants are reversible (i.e. you can revert the change to get original the password).