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философско-религиозная энциклопедия мусульманского братства Ихван ас-Сафа stresses
relig.	Epistles of the Brethren of Purity; Rasa'il ikhwan as-safa' wa khillan al-wafa'; Rasa'il ikhwan as-safa' wa khillan alwafa' ("Epistles of the Brethren of Purity and Loyal Friends", a philosophical and religious encyclopaedia)