Students shout slogans as they protest on the Sanaa University campus in Sanaa, Yemen, on Sunday, Sept. 18, 2011, to show their support of a boycott of university studies as part of demonstrations demanding the resignation of Yemeni President Ali Abdullah Saleh. The Arabic on the billboard reads, "The resumption of school before dropping the regime is betrayal to the blood of the martyrs." (AP Photo/Hani Mohammed)
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