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"Babbel is one of the stalwarts of the online language-learning sphere, having set up shop on the Web back in 2008. Following its first foray onto mobile with iOS back in 2010, it later ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/apps/2014/01/15/babbel-brings-13-android-language-apps-one-roof/>