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I thought you might be interested in looking at مسألة الجسمين.
http://forum.qasweb.org/index.php?/topic/3253-%D9%85%D8%B3%D8%A3%D9%84%D8%A9-%D8%A7%D9%84%D8%AC%D8%B3%D9%85%D9%8A%D9%86/&do=findComment&comment=10028
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