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By Ali Abdelaty and Maggie Fick CAIRO (Reuters) - A protester was killed in Egypt and a bomb wounded two policemen on Sunday, the anniversary of the 2011 uprising that toppled autocrat Hosni Mubarak, security sources said. The anniversary is a test of whether Islamists and liberal activists who have faced a tough security crackdown have the resolve to challenge Egypt's U.S.-backed government once again. Security forces have been stamping out dissent since the army ousted president Mohamed Mursi of the Muslim Brotherhood in July 2013 after mass protests against his rule. Dozens of protesters were killed during last year's anniversary of the revolt centered in Cairo's Tahrir Square.