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Nuns walks along the shore of Copacabana beach in Rio de Janeiro on July 28, 2013 before Pope Francis celebrates the final mass of his visit to Brazil. Throngs of pilgrims attending World Youth Day (WYD) spent the night sleeping on the beach before Sunday’s final mass, while the city’s mayor said he expects up to three million people to pack the beach for the occasion. AFP PHOTO / YASUYOSHI CHIBA