LENDELEDE, BELGIUM - APRIL 21ST 2017:a hand holding a Samsung Galaxy S5 mini mobile phone which displays the Duolingo language app. Illustrative editorial image outside on a green, natural background. Shutterstock Image - LENDELEDE, BELGIUM - APRIL 21ST 2017:a hand holding a Samsung Galaxy S5 mini mobile phone which displays the Duolingo language app. Illustrative editorial image outside on a green, natural background. - ID: 681307543

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