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Britain's Prime Minister David Cameron, right, poses for photographers as he greets Britain's Queen Elizabeth II at his official residence at 10 Downing Street in central London, Tuesday, Dec. 18, 2012. The Queen was visiting Downing Street to attend the cabinet as an observer. (AP Photo/Lefteris Pitarakis)

Associated Press
Britain's Prime Minister David Cameron, right, poses for photographers as he greets Britain's Queen Elizabeth II at his official residence at 10 Downing Street in central London, Tuesday, Dec. 18, 2012. The Queen was visiting Downing Street to attend the cabinet as an observer. (AP Photo/Lefteris Pitarakis)
Britain's Prime Minister David Cameron, right, poses for photographers as he greets Britain's Queen Elizabeth II at his official residence at 10 Downing Street in central London, Tuesday, Dec. 18, 2012. The Queen was visiting Downing Street to attend the cabinet as an observer. (AP Photo/Lefteris Pitarakis)
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