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http://archive.univ-biskra.dz/moodle2019/pluginfile.php/80424/course/summary/%D9%86%D8%AA%D8%A7%D8%A6%D8%AC-%D8%A7%D9%84%D8%AD%D8%B1%D8%A8-%D8%A7%D9%84%D8%B9%D8%A7%D9%84%D9%85%D9%8A%D8%A9-%D8%A7%D9%84%D8%AB%D8%A7%D9%86%D9%8A%D8%A9-%D8%B9%D9%84%D9%89-%D8%A8%D9%84%D8%AF%D8%A7%D9%86-%D8%A7%D9%84%D9%85%D8%B4%D8%B1%D9%82-%D8%A7%D9%84%D8%B9%D8%B1%D8%A8%D9%8A.pdf