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Cars burn during clashes between supporters and opponents of President Mohammed Morsi in Alexandria, Egypt, Friday, Dec. 14, 2012, a day before the referendum on the constitution. Opposing sides in Egypt's political crisis were staging rival rallies on Friday, the final day before voting starts on a contentious draft constitution that has plunged the country into turmoil and deeply divided the nation.(AP Photo/Ahmed Ramadan)

Associated Press
Cars burn during clashes between supporters and opponents of President Mohammed Morsi in Alexandria, Egypt, Friday, Dec. 14, 2012, a day before the referendum on the constitution.  Opposing sides in Egypt's political crisis were staging rival rallies on Friday, the final day before voting starts on a contentious draft constitution that has plunged the country into turmoil and deeply divided the nation.(AP Photo/Ahmed Ramadan)
Cars burn during clashes between supporters and opponents of President Mohammed Morsi in Alexandria, Egypt, Friday, Dec. 14, 2012, a day before the referendum on the constitution. Opposing sides in Egypt's political crisis were staging rival rallies on Friday, the final day before voting starts on a contentious draft constitution that has plunged the country into turmoil and deeply divided the nation.(AP Photo/Ahmed Ramadan)
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