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25 of 25: FILE - In this Sunday, April 24, 2005 file photo, Pope Benedict XVI greets the crowd after celebrating his installation Mass in St. Peter's Square at the Vatican. Pope Benedict XVI announced Monday, Feb. 11, 2013, he would resign Feb. 28 because he is simply too old to carry on. (AP Photo/Gregorio Borgia, File) (AP Photo/ Gregorio Borgia)

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