Francis

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Pope Francis leaves at the end of his weekly general audience in St. Peter's Square at the Vatican on Wednesday, May 22, 2013. (AP Photo/Alessandra Tarantino)

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Pope Francis greets the faithful in St. Peter Square at the Vatican, after celebrating a Pentecost Mass, Sunday, May 19, 2013. (AP Photo/Andrew Medichini)

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Pope Francis waves to the crowd packed into St. Peter's Square at the Vatican on Sunday, May 12, 2013, after leading his first canonization ceremony. (AP Photo/Alessandra Tarantino)

Pope Francis greets the faithful from his popemobile as he leaves St. Peter's Square at the Vatican at the end of his weekly general audience on Wednesday, May 8, 2013. Francis also warned nuns gathered from around the world against using their vocations for personal ambition, saying priests and sisters who do so "do more harm to the church." (AP Photo/Andrew Medichini)

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** FILE ** U.N. Secretary-General Ban Ki-moon attends a media briefing at a hotel in Rome following his private audience with Pope Francis at the Vatican, Tuesday, April 9, 2013. (AP Photo/Alessandra Tarantino)

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** FILE ** Pope Francis salutes as he arrives for his weekly general audience in St. Peter Square at the Vatican Wednesday, April 3, 2013. (AP Photo/Alessandra Tarantino)