In this Thursday, April 30, 2015 photo, a whirling dervish spins during a performance in collaboration with the Al-Tannoura Egyptian Heritage Dance Troupe at the El Dammah Theatre in Cairo, Egypt. (AP Photo/Amr Nabil)
In this Thursday, April 30, 2015 photo, a whirling dervish spins during a performance in collaboration with the Al-Tannoura Egyptian Heritage Dance Troupe at the El Dammah Theatre in Cairo, Egypt. (AP Photo/Amr Nabil)
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