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A protester stands in front of a burning barricade during a demonstration in Cairo January 28, 2011. Police and demonstrators fought running battles on the streets of Cairo on Friday in a fourth day of unprecedented protests by tens of thousands of Egyptians demanding an end to President Hosni Mubarak's three-decade rule. REUTERS/Goran Tomasevic (EGYPT - Tags: CIVIL UNREST POLITICS) FOR BEST QUALITY IMAGE: ALSO SEE GF2E7BB0T3701