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Rainbow Necklace Trick by Serhiy Grabarchuk
You have the seven cards with a many-colored necklace on each of them. Ask someone to choose any two-colored bead from any necklace, and then ask to turn over all cards without
chosen bead (for this simply click each of these cards). After a single peek at the cards you may say exactly which bead was chosen. How do you think you can perform it?
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