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"According to Windows Phone and Windows advertising network AdDuplex\u00A0\u2013 recently flush with $500,000 in funding \u2013 the Lumia 520 has taken the top spot among Windows Phone handsets, ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/mobile/2013/07/11/lumia-520-downmarket-strategy/>