Two Egyptian protesters walk on top of cement blocks near the presidential palace, in Cairo, Egypt, Sunday, Dec. 9, 2012. Egypt's liberal opposition has called for more protests on Sunday after the president made concessions overnight that fell short of their demands to rescind a draft constitution going to a referendum on Dec. 15. (AP Photo/Nasser Nasser)

Associated Press
Two Egyptian protesters walk on top of cement blocks near the presidential palace, in Cairo, Egypt, Sunday, Dec. 9, 2012. Egypt's liberal opposition has called for more protests on Sunday after the president made concessions overnight that fell short of their demands to rescind a draft constitution going to a referendum on Dec. 15. (AP Photo/Nasser Nasser)
Two Egyptian protesters walk on top of cement blocks near the presidential palace, in Cairo, Egypt, Sunday, Dec. 9, 2012. Egypt's liberal opposition has called for more protests on Sunday after the president made concessions overnight that fell short of their demands to rescind a draft constitution going to a referendum on Dec. 15. (AP Photo/Nasser Nasser)
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