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The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
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It starts out on a grand adventure searching for the perfect piece to complete itself, while singing and enjoying the scenery. But after the circle finally finds the exact-sized wedge that fits it, it begins to realize that it can no longer do the things it used to enjoy doing, like singing or rolling slowly enough to enjoy the company of a worm or butterfly.
A Georgian palimpsest from the 5th or 6th century. The word palimpsest derives from Latin palimpsestus, which derives from παλίμψηστος, palímpsēstos [4] (from Ancient Greek πάλιν (pálin) 'again' and ψάω (psáō) 'scrape'), a compound word that describes the process: "The original writing was scraped and washed off, the surface resmoothed, and the new literary material ...
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By printing a notice on the page, such as "this page has been intentionally left blank", test-takers will not be concerned that their test has been misprinted, especially as test instructions often instruct students to check for missing or blank pages and to report any defective test booklets to a proctor.
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