Took me about 10 minutes, and maybe 20 tries. I guessed right, purely by chance, several times, but hadn't figured out the pattern till I read the first post in this thread that talked about the "name." Went back and looked at it again and got it right away.
I agree, it has zero to do with intelligence, and has everything to do with how your brain is wired, and how relaxed a thinker you are.
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