LONDON, ENGLAND - OCTOBER 21: Queen Elizabeth II and the Prince Philip, Duke of Edinburgh view a display of Singaporean items from the Royal Collection with the president of Singapore Tony Tan Keng Yam (C) and his wife Mary (behind) at Buckingham Palace on October 21, 2014 in London, England. The President is at the beginning of his four day stay during which he will hold a bilateral meeting with Prime Minister David Cameron. (Photo by Anthony Devlin - WPA Pool/Getty Images)
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