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VATICAN CITY, VATICAN - DECEMBER 13: Pope Francis attends the Holy Mass and opening of the Holy Door of John Lateran Basilica on December 13, 2015 in Vatican City, Vatican. The Year of Mercy started 8 Dec on the Feast of the Immaculate Conception, and will conclude 20 Nov 2016 on the Feast of Christ the King. (Photo by Franco Origlia/Getty Images)