"A protester looks at graffiti on cement blocks in front of the presidential palace in Cairo, Egypt, Sunday, Dec. 16, 2012. Key Egyptian rights groups called Sunday for a repeat of the first round of the constitutional referendum, alleging the vote was marred by widespread violations. Islamists who back the disputed charter claimed they were in the lead with a majority of ""yes"" votes. Arabic writing on the cement block, right, reads, ""no to the Muslim Brotherhood constitution,"" (AP Photo/Hassan Ammar)"
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