2 of 49: Anti-government protesters throw stones during clashes on the sidelines of a demonstration in Tahrir Square, Cairo, Egypt, Friday, Feb. 4, 2011. Tens of thousands packed central Cairo Friday, waving flags and singing the national anthem, emboldened in their campaign to oust President Hosni Mubarak after they repelled pro-regime attackers in two days of bloody street fights. (AP Photo/Khalil Hamra) (AP Photo/ Khalil Hamra)

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