Duolingo - Wikipedia
https://en.wikipedia.org/wiki/Duolingo
WebDuolingo, Inc. is an American educational technology company that produces learning apps and provides language certification.Duolingo offers courses on music, math, and 43 languages, ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Swahili. Other services include the Duolingo English Test …
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