Oops. I was going to post the challenge tonight -- actually, a couple of nights ago, but I've been unspeakably busy the last couple of days and kept not being able to get to it. (I think the mail server may have misbehaved or something, too; I got the mail on the third.) Ah, well; this sounds like an interesting one. I'd like, rather belatedly, to thank the people who voted for me; I'm honored. Oh, and the Academy. Can't forget to thank the Academy. ;)