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I thought you might be interested in looking at كل ما تريد ان تعرفه عن النظريه النسبيه 4.
http://forum.qasweb.org/index.php?/topic/9590-%D9%83%D9%84-%D9%85%D8%A7-%D8%AA%D8%B1%D9%8A%D8%AF-%D8%A7%D9%86-%D8%AA%D8%B9%D8%B1%D9%81%D9%87-%D8%B9%D9%86-%D8%A7%D9%84%D9%86%D8%B8%D8%B1%D9%8A%D9%87-%D8%A7%D9%84%D9%86%D8%B3%D8%A8%D9%8A%D9%87-4/&do=findComment&comment=34422
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