Yahya%20bin%20Isma'il%20al-Wasti%20%D9%8A%D8%AD%D9%8A%D9%89%20%D8%A8%D9%86%20%D8%A5%D8%B3%D9%85%D8%A7%D8%B9%D9%8A%D9%84%20%D8%A7%D9%84%D9%88%D8%A7%D8%B3%D8%B7%D9%8A%20%D8%A3%D8%A8%D9%88%20%D8%B2%D9%83%D8%B1%D9%8A%D8%A7 - Teacher/Student Tree