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VATICAN CITY, VATICAN - SEPTEMBER 28:  Pope Francis (R) greets Pope Emeritus Benedict XVI as he arrives at St. Peter's Basilica during a celebration  for grandparents and the elderly on September 28, 2014 in Vatican City, Vatican. Pope Francis celebrated Mass on Sunday morning in St Peter's Square, following a special encounter with elderly persons. In his homily, the Holy Father said 'Elderly are key to health of free society'.  (Photo by Franco Origlia/Getty Images) Franco Origlia/Getty Images
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