LONDON, ENGLAND - MAY 10: The Speaker of the House of Commons John Bercow (L) introduces Prime Minister David Cameron (C) to Queen Elizabeth II, as Chris Grayling (2nd R), leader of the House of Commons and Chris Bryant, shadow leader of the House of Commons, look on during a reception in Buckingham Palace to mark the Queen's 90th birthday on May 10, 2016 in London, England. (Photo by Paul Hackett - WPA Pool / Getty Images)
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