Benedict Xvi

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Altar girls protect themselves against the cold with rescue blankets as they walk to a mass with Pope Benedict XVI in Freiburg, southwestern Germany. (AP Photo/Matthias Schrader)

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Pilgrims walk to a mass with Pope Benedict XVI on the tarmac of the airport in Freiburg, southwestern Germany. (AP Photo/Matthias Schrader)

Pope Benedict XVI arrives for a meeting with Catholics involved in the Church and society, at the concert hall in Freiburg, southern Germany, Sunday, Sept. 25, 2011, the last day of his four-day official visit to Germany. (AP Photo/Miro Kuzmanovic, pool)

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Pope Benedict XVI touches a baby as he drives through the crowd in his popemobile before celebrating Mass in Freiburg, Germany, on Sunday, Sept. 25, 2011, the last day of a four-day visit to his homeland of Germany. (AP Photo/Michael Probst)

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Pope Benedict XVI arrives in his popemobile to celebrate an open air mass in front of the St. Mary's cathedral in Erfurt, central Germany, Saturday, Sept. 24, 2011. Pope Benedict XVI is on a four-day official visit to his homeland Germany. (AP Photo/Jens Meyer)

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ASSOCIATED PRESS German President Christian Wulff and Chancellor Angela Merkel welcome Pope Benedict XVI at Berlin's airport on Thursday, the start of a four-day visit.

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In anticipation of Pope Benedict XVI's visit to his German homeland, the tabloid Bild Zeitung has covered its headquarters in Berlin with a giant reprint of its front page of April 20, 2005, when Benedict was elected. The headline reads, "We Are Pope!" (AP Photo/Markus Schreiber)

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Associated Press Pope Benedict XVI serves Communion to a girl wearing a T-shirt bearing his name while celebrating Mass at Cuatro Vientos airfield outside Madrid on Sunday. The pope was in Madrid for the four-day World Youth Day event that drew 1.5 million.

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Pope Benedict XVI is cheered by faithful as he arrives in Plaza de Cibeles to meet with youths, in Madrid, Thursday, Aug. 18, 2011. The Pontiff arrived in the Spanish capital of Madrid for a four-day visit on the occasion of the Catholic Church's World Youth Day. (AP Photo/Gregorio Borgia)

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Pope Benedict XVI puts on a hat presented to him by a young man representing the youth from Latin America in Madrid's Cibeles square Thursday Aug. 18, 2011. Pope Benedict XVI denounced the profit-at-all-cost mentality that he says is behind Europe's current economic crisis as he arrived in hard-hit Spain on Thursday, and said morals and ethics must play a greater role in formulating economic policy in the future. (AP Photo/Armando Franca)

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Pope Benedict XVI, left, and Madrid's Archbishop Antonio Maria Rouco Varela, right, are seen at Puerta de Alcala square in Madrid on Thursday, Aug. 18, 201. Pope Benedict XVI denounced the profit-at-all-cost mentality that he says is behind Europe's current economic crisis as he arrived in hard-hit Spain on Thursday, and said morals and ethics must play a greater role in formulating economic policy in the future. (AP Photo/Arturo Rodriguez)

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Pilgrims wave flags while they wait for Pope Benedict XVI's arrival at Cibeles central square in Madrid, Thursday Aug. 18, 2011. The Pontiff arrived in Madrid for a four-day visit on the occasion of the Catholic Church's World Youth Day. (AP Photo/Daniel Ochoa de Olza)

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Pope Benedict XVI waves from his Popemobile as he crosses the city of Madrid on his way to Cibeles central square, Thursday Aug. 18, 2011. The Pontiff arrived in Madrid for a four-day visit on the occasion of the Catholic Church's World Youth Day. (AP Photo/Daniel Ochoa de Olza)

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Pope Benedict XVI waves from his Popemobile as he crosses the city of Madrid on his way to Cibeles central square, Thursday Aug. 18, 2011. The Pontiff arrived in Madrid for a four-day visit on the occasion of the Catholic Church's World Youth Day. (AP Photo/Daniel Ochoa de Olza)

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Pilgrims are sprayed with water as thousands wait for the arrival of Pope Benedict XVI in Madrid on Thursday, Aug. 18, 2011. Pope Benedict XVI denounced the profit-at-all-cost mentality that he says is behind Europe's current economic crisis as he arrived in hard-hit Spain on Thursday, and said morals and ethics must play a greater role in formulating economic policy in the future.(AP Photo/Arturo Rodriguez)

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Pope Benedict XVI waves from his Popemobile in Puerta de Alcala square in Madrid on Thursday, Aug. 18, 201. Pope Benedict XVI is visiting Madrid between Aug. 18- 21. Pope Benedict XVI warned Thursday at the start of a visit to crisis-hit Spain that Europe won't be able to emerge from its economic woes unless it realizes that economic policy cannot be guided by a profit-driven mentality alone but must take into account ethical considerations that look out for the common good.(AP Photo/Arturo Rodriguez)

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King Juan Carlos bows in front of Pope Benedict XVI he arrives at the airport in Madrid, Spain, Thursday Aug. 18, 2011. (AP Photo/Emilio Morenatti)

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Pope Benedict XVI mounts the saluting stand next to King Juan Carlos, right, and Queen Sofia of Spain Juan Carlos as he arrives at Barajas Airport in Madrid, Spain, Thursday Aug. 18, 2011. (AP Photo/Emilio Morenatti)

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Pope Benedict XVI waves as he arrives at Madrid Barajas airport, Thursday, Aug. 18, 2011. The Pontiff arrived in the Spanish capital of Madrid for a four-day visit on the occasion of the Catholic Church's World Youth Day. (AP Photo/Emilio Morenatti)

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ASSOCIATED PRESS A demonstrator shouts slogans against the visit of Pope Benedict XVI in Madrid on Wednesday. The pope is due to arrive Thursday to celebrate World Youth Day, and thousands of protesters railing against his visit marched through central Madrid.