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Message-ID: <BANLkTimb8xc7fVLsupmhhrATFSUAX8_N+A@mail.gmail.com>
Date: 2011-06-21T03:50:19Z
From: Jorge Ivan Velez
Subject: omitting columns from a data frame
In-Reply-To: <BANLkTik5y2W=YQf1NaiTtfEd+HKh9d=Hww@mail.gmail.com>

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