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In the third part of our series on the rise in the Arab world of ultra-conservative Muslims known as Salafis, NPR's Leila Fadel takes us to Manouba University on the outskirts of the Tunisian capital Tunis. The school's dean has vowed to uphold a rule that bars women from wearing a face veil in the classroom. Salafi students oppose the ban, and see this as a battle for freedom of religion. The issue is a microcosm of a much larger battle between the staunchly secular and the deeply pious in Tunisia.