Britain's Prime Minister David Cameron makes a joint appearance with the Mayor of London, Sadiq Khan, (not pictured) as they launch the 'Britain Stronger In Europe' guarantee card in west London on May 30, 2016, ahead of the EU referendum in Britain on June 23, 2016. / AFP PHOTO / POOL / Yui Mok (Photo credit should read YUI MOK/AFP/Getty Images)
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