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AW: st: AW: RE: AW: how to identify unique id variables within groups?


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: AW: RE: AW: how to identify unique id variables within groups?
Date   Wed, 20 May 2009 16:50:33 +0200

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