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Message-ID: <317737de0809061153s4581d688na3542d1ec9b4ecb7@mail.gmail.com>
Date: 2008-09-06T18:53:02Z
From: Jorge Ivan Velez
Subject: subsetting a data frame
In-Reply-To: <342728.7274.qm@web36903.mail.mud.yahoo.com>

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