Pedestrians walk past the National Gallery in London, U.K., [Getty Images]

UNITED KINGDOM - DECEMBER 01: Pedestrians walk past the National Gallery in London, U.K., on Monday, Dec. 1, 2008. London's National Gallery and the National Galleries of Scotland, or NGS, have until the end of the year to buy ``Diana and Actaeon,'' currently on loan to the nation from the Duke of Sutherland. (Photo by Jason Alden/Bloomberg via Getty Images)

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