Philip

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Britain's Prince Philip thanks hospital staff as he leaves the Aberdeen Royal Infirmary in Aberdeen, Scotland, on Monday, Aug. 20, 2012, after treatment for a bladder infection. (AP Photo/Andrew Milligan, PA Wire)

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Britain's Prince Philip, the Duke of Edinburgh, attends the opening ceremony of the 2012 Summer Olympics on Friday, July 27, 2012, in London. (AP Photo/Jae C. Hong)

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FILE This Wednesday, May 9, 2012 file photo shows Britain's Queen Elizabeth II seated beside Prince Philip in the House of Lords as she waits to read the Queen's Speech to lawmakers in London. (AP Photo/Alastair Grant, Pool)

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Queen Elizabeth II and Prince Philip wave to thousands of people at Stormont estate in Belfast on Wednesday. The queen and the Duke of Edinburgh continued their Northern Ireland visit to mark the queen's Diamond Jubilee. (Associated Press)

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** FILE ** Britain's Queen Elizabeth II and Prince Philip arrive by carriage in the parade ring on the fourth day of the Royal Ascot horse race meeting at Ascot, England, on Friday, June 22, 2012. (AP Photo/Alastair Grant)

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Prince Philip waves as he leaves King Edward VII Hospital in central London on Saturday, June 9, 2012, after being treated for a bladder infection. He will celebrate his 91st birthday Sunday privately with members of the royal family. (AP Photo/Press Associaiton, Max Nash)

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Students with the British School of Washington check out tiny cut outs of Queen Elizabeth II and Prince Philip, Duke of Edinburgh on a cake during the school's "Big Picnic Lunch" in celebration of Queen Elizabeth's Diamond Jubilee. (Andrew Harnik/The Washington Times)