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People learning languages in a university setting often learn words not in common usage in the countries where the language is most commonly spoken. It's in the textbook, so they learn it. The question becomes ... how did such an obscure word end up in the textbook to begin with? Is it to keep other textbook manufacturers from plagarizing? "Hey, you used hoarfrost! That's my obscure word!! I'm suing!!"
Cartography companies add roads that aren't really roads to their maps so they can catch if their competitors are stealing their work.
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