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Just curious.
Did you know this from Gotham like I did? or google which is smart thing to do if you don't know? or just know it because you are smarter than the average bear.
Too bad no prize here but I am giving out a prize for guessing the price of my dinner in my latest post. :-)

I heard of it a few years ago. I think it is a riddle that usually only children can solve.

Ah.... yes, kids don't think as complicated as us.
Thanks for your reply. :-)

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