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2. Duolingo - Wikipedia

   en.wikipedia.org/wiki/Duolingo

   Download as PDF; Printable version; In other projects Wikimedia Commons; ... The piano is designed to work with Duolingo's music lessons. [82] Duolingo English test

3. List of language self-study programs - Wikipedia

   en.wikipedia.org/wiki/List_of_language_self...

   free audio, apps and downloads, sell optional books Colloquial by Routledge: 56: 1 (English) physical media: sell books and CDs Central Institute of Indian Languages: 47: 1 (English) physical media: sell books Duolingo: 43: 25 application or web: freemium with all learning features free Foreign Service Institute: 42: 1 (English) web: free

4. Valyrian languages - Wikipedia

   en.wikipedia.org/wiki/Valyrian_languages

   2.3 Duolingo course. ... Download as PDF; Printable version; ... As a part of this update, Peterson created audio for the course's lessons and exercises.

5. Category:Duolingo - Wikipedia

   en.wikipedia.org/wiki/Category:Duolingo

   Download as PDF; Printable version; In other projects Wikidata item; ... Pages in category "Duolingo" The following 7 pages are in this category, out of 7 total. ...

6. Luis von Ahn - Wikipedia

   en.wikipedia.org/wiki/Luis_von_Ahn

   Duolingo logo. In 2009, von Ahn and his graduate student Severin Hacker began to develop Duolingo, a language education platform. They founded a company of the same name, with von Ahn as chief executive officer and Hacker as chief technology officer. In November 2011, a private beta test of Duolingo was launched and the app was released to the ...

7. Duolingo English Test - Wikipedia

   en.wikipedia.org/wiki/Duolingo_English_Test

   The Duolingo English Test (DET) is a standardized test of the English language designed to be internet-based rather than paper-based. DET is an adaptive test that uses an algorithm to adapt the difficulty of the test to the test-taker.