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Editor: Vicki Allen + 1 202 898 8457 Picture Desk: Singapore + 65 6870 3775 Graphics queries: + 65 6870 3595 (All times GMT/ET) TOP STORIES Vice president quits as Egypt votes on constitution CAIRO - Egypt's vice-president resigns as Egyptians vote ina referendum that is expected to approve a new constitution thatlays the foundations for the country's transition to democracybut will strip him of