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VATICAN CITY, VATICAN - MARCH 29: Tourists write postcards in St Peter's Square on March 29, 2013 in Vatican City, Vatican. (Photo by Christopher Furlong/Getty Images)

VATICAN CITY, VATICAN - MARCH 29:  Tourists write postcards in St Peter's Square on March 29, 2013 in Vatican City, Vatican.  (Photo by Christopher Furlong/Getty Images)