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Spot it! (http://www.blueorangegames.com/spotit/, also known as Dobble) is an image-recognition game played with a deck of round cards, where each pair of cards has exactly one matching image. Players name the matching image to claim the pair; it's an obviously good match for language learning. If you're wondering how a deck of 55 or 57 cards can be set up so that each two cards have exactly one matching image, here is an explanation of the math behind it: https://www.smithsonianmag.com/science-nature/math-card-game-spot-it-180970873/. Naturally, language teachers may want to create their own customized sets to practice particular themes. Here is a collection of formulas for building decks of different sizes: https://radiganengineering.com/2013/01/spot-it-howd-they-do-that/. Enjoy!