Thanks, Anna, though I confess I don't get what warrants the compliment...

Thanks, Faldage--I had a feeling I was missing something somewhere, and re-reading the article helped me realize what it was: as many logic puzzles as I've done, I still fell into the trap: just because four does not have a vowel on the other side, it doesn't automatically mean that seven does. [smacking forehead e] (Now, if we'd been told that there were a total of two consonants and two vowels on those cards...)