Soldiers walk past a military tank guarding the presidential palace in Cairo, 

Soldiers walk past a military tank guarding the presidential palace in Cairo, Egypt, Thursday, Dec. 13, 2012. Egypt's opposition called on its followers to vote "no" in a crucial referendum on a disputed constitution drafted by Islamist supporters of President Mohammed Morsi. (AP Photo/Hassan Ammar)
Associated Press
Soldiers walk past a military tank guarding the presidential palace in Cairo, Egypt, Thursday, Dec. 13, 2012. Egypt's opposition called on its followers to vote "no" in a crucial referendum on a disputed constitution drafted by Islamist supporters of President Mohammed Morsi. (AP Photo/Hassan Ammar)
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