A nun clasps her hands in prayer during a Mass honoring Pope Benedict XVI at the Metropolitan Cathedral in Buenos Aires, Argentina, Wednesday, Feb. 27, 2013. Benedict made his final public appearance as pontiff in St. Peter's Square Wednesday. He thanked his flock for respecting his retirement, which takes effect Thursday. (AP Photo/Natacha Pisarenko)

Associated Press
A nun clasps her hands in prayer during a Mass honoring Pope Benedict XVI at the Metropolitan Cathedral in Buenos Aires, Argentina, Wednesday, Feb. 27, 2013.  Benedict made his final public appearance as pontiff in St. Peter's Square Wednesday. He thanked his flock for respecting his retirement, which takes effect Thursday. (AP Photo/Natacha Pisarenko)
A nun clasps her hands in prayer during a Mass honoring Pope Benedict XVI at the Metropolitan Cathedral in Buenos Aires, Argentina, Wednesday, Feb. 27, 2013. Benedict made his final public appearance as pontiff in St. Peter's Square Wednesday. He thanked his flock for respecting his retirement, which takes effect Thursday. (AP Photo/Natacha Pisarenko)
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