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That's barely even a puzzle. It's more of an optical illusion



Lots of people take a long time to get this one. It's what I call an STF problem - Slap the Forehead." Unless you see it instantly, when you do see it you are so frustrated ...


Argh. Yes, that's exactly how I felt when I finally got it. :p


me too. wow, it's sooooo simple. the trick is to not think.


it's more of "high school training in math has failed you"

(right triangle <=> Pythagoras) -> bad




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