Here's a riddle.
There's a table with an infinate amount of quarters. 100 of those quarters are tails-side up, the rest are heads-side up. You're blind and you have mittens on (you can't feel the faces of the quarters). How can you seperate the quarters into two piles so that both piles have the same amount of quarters tails-side up (the two piles do NOT need the same amount of quarters, just the same amount of quarters with the tails-side up)?
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