Benedict Xvi

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Pope Benedict XVI celebrates a Pentecost Mass inside St. Peter's Basilica, at the Vatican, Sunday, May 27, 2012. (AP Photo/Andrew Medichini)

** FILE ** Pope Benedict XVI, accompanied by his private secretary, Monsignor Georg Gaenswein (top left), and his butler, Paolo Gabriele, arrives in St. Peter's Square at the Vatican for a general audience on Wednesday, May 23, 2012. (AP Photo/Andrew Medichini)

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Pope Benedict XVI claps as Bavarian children in traditional garb dance in celebration of the pontiff's 85th birthday anniversary in the Clementine Hall at the Vatican on Monday, April 16, 2012. (AP Photo/Gregorio Borgia, Pool)

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Pope Benedict XVI greets the faithful after his "Urbi and Orbi" ("to the city and to the world") blessing following Easter Mass in St. Peter's Square at the the Vatican on Sunday, April 8, 2012. (AP Photo/Pier Paolo Cito)

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Pope Benedict XVI greets the faithful after his "Urbi and Orbi" ("to the city and the world") blessing following the Easter Mass in St. Peter's Square at the Vatican on Sunday, April 8, 2012. (AP Photo/Osservatore Romano)

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Thousands of the faithful gather in St. Peter's Square at the Vatican for the Easter Mass celebrated by Pope Benedict XVI on Sunday, April 8, 2012. (AP Photo/Pier Paolo Cito)

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Pope Benedict XVI, holding a tall, lit, white candle, enters a hushed and darkened St. Peter's Basilica, at the Vatican Saturday, April 7, 2012, to begin the Vatican's Easter vigil service. Except for the twinkle of camera flashes, the basilica was almost pitch-black as the thousands of faithful in pews awaited Benedict's arrival Saturday night. (AP Photo/Pier Paolo Cito)

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Pope Benedict XVI, holding a tall, lit, white candle, enters a hushed and darkened St. Peter's Basilica, at the Vatican Saturday, April 7, 2012, to begin the Vatican's Easter vigil service. Except for the twinkle of camera flashes, the basilica was almost pitch-black as the thousands of faithful in pews awaited Benedict's arrival Saturday night. (AP Photo/Pier Paolo Cito)

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Pope Benedict XVI (foreground) is photographed by the faithful as he tours St. Peter's Square during his weekly general audience at the Vatican on Wednesday, April 4, 2012. (AP Photo/Gregorio Borgia)

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Pope Benedict XVI arrives for Palm Sunday Mass in St. Peter's Square at the Vatican on Sunday, April 1, 2012. (AP Photo/Gregorio Borgia)

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Pope Benedict XVI arrives to lead an open-air Mass at Revolution Square in Havana on Wednesday, his last day in Cuba. The square includes an image of Communist hero Ernesto "Che" Guevara (background, left). (Associated Press)

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Pope Benedict XVI is greeted by children during his visit to the sanctuary of the Virgin of Charity of Cobre, Cuba's patron saint, in the little town of El Cobre, outside of Santiago, on Tuesday. Benedict is on the second day of his Cuban tour. (Associated Press)