Oh oh, someone else smarter than MVP. Can his ego withstand the hit? Stay tuned. 
I have to say I agree with DMs analysis, which is why I didn't post. But seeing as how the cats now out of the bag, I have to lend my support to the young genius. He's completely right.
Sorry MVP, it was pretty transparent.
My suggestion would be to post the answer in *white* font. If people want to view the answer, they can highlight the text & the answer will appear. This way, those who haven't had the chance to guess still can, and those who want to learn can too.
Second thoughts can generally be amended with judicious action; injudicious actions can seldom be recovered with second thoughts.
--Cyteen by C.J.Cherryh