Protestors wearing gas masks gather near Cairo's Tahrir Square during clashes with police on November 23, 2011.
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Protestors wearing gas masks gather near Cairo's Tahrir Square during clashes with police on November 23, 2011.
A man sells gas masks to combat the effects of tear gas in Cairo's Tahrir Square on November 23, 2011.
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A man sells gas masks to combat the effects of tear gas in Cairo's Tahrir Square on November 23, 2011.
Protestors sit on a wall near Cairo's Tahrir Square after police withdrew on November 23, 2011.
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Protestors sit on a wall near Cairo's Tahrir Square after police withdrew on November 23, 2011.
An Egyptian protester uses improvisation to protect his face and head from tear gas during clashes with riot police near Cairo's Tahrir Square on November 23, 2011.
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An Egyptian protester uses improvisation to protect his face and head from tear gas during clashes with riot police near Cairo's Tahrir Square on November 23, 2011.
An injured Egyptian protester in heavy face bandages walks in Tahrir Square in Cairo on November 23, 2011.
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An injured Egyptian protester in heavy face bandages walks in Tahrir Square in Cairo on November 23, 2011.
A protestor has his eyes sprayed to help counteract the effects of tear gas near Tahrir Square on November 22, 2011 in Cairo.
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A protestor has his eyes sprayed to help counteract the effects of tear gas near Tahrir Square on November 22, 2011 in Cairo.
A protester, his face sprayed with protective medical cream, covers his nose and mouth to avoid tear gas inhalation at Cairo's Tahrir Square on November 22, 2011.
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A protester, his face sprayed with protective medical cream, covers his nose and mouth to avoid tear gas inhalation at Cairo's Tahrir Square on November 22, 2011.
A protester wears a gas mask as tens of thousands of Egyptians pack Cairo's Tahrir Square on November 22, 2011.
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A protester wears a gas mask as tens of thousands of Egyptians pack Cairo's Tahrir Square on November 22, 2011.
Egyptians protesters attend a funeral of a victim supposedly killed during clashes with Egyptian police in Tahrir Square on November 22, 2011.
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Egyptians protesters attend a funeral of a victim supposedly killed during clashes with Egyptian police in Tahrir Square on November 22, 2011.
An injured Egyptian protester is helped away during clashes with security forces at Tahrir Square in Cairo on November 21, 2011.
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An injured Egyptian protester is helped away during clashes with security forces at Tahrir Square in Cairo on November 21, 2011.
Eyptian protesters throw stones during clashes with security forces at Tahrir Square in Cairo on November 21, 2011.
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Eyptian protesters throw stones during clashes with security forces at Tahrir Square in Cairo on November 21, 2011.
An Egyptian protester shows rubber bullet shells and tear gas canisters during clashes with riot police at Cairo's Tahrir Square on November 20, 2011.
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An Egyptian protester shows rubber bullet shells and tear gas canisters during clashes with riot police at Cairo's Tahrir Square on November 20, 2011.
An Egyptian protester wears pictures of former Egyptian president Gamal Abdel Nasser during a rally in Cairo's Tahrir Square on November 18, 2011.
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An Egyptian protester wears pictures of former Egyptian president Gamal Abdel Nasser during a rally in Cairo's Tahrir Square on November 18, 2011.
Tens of thousands of Egyptian protesters wave national flags during a rally in Cairo's Tahrir Square on November 18, 2011.
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Tens of thousands of Egyptian protesters wave national flags during a rally in Cairo's Tahrir Square on November 18, 2011.