European Union Summit in Brussels [Getty Images]

BRUSSELS, BELGIUM - APRIL 23: French President Francois Hollande (R2), German Chancellor Angela Merkel (L2), Italian Prime Minister Matteo Renzi (L) and Prime Minister of the United Kingdom David Cameron (R) meet ahead of European Union Summit in Brussels on April 23, 2015. (Photo by Herman Yves / Pool/Anadolu Agency/Getty Images)

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