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Message-ID: <CAKL8G3GXBGZW9Ct0_HdGQOyL68fjKyts9HousqqexgcDe0vm9w@mail.gmail.com>
Date: 2012-12-18T14:43:40Z
From: Jorge I Velez
Subject: Summarizing elements for a data.frame
In-Reply-To: <CA+dpOJkm07kV17mSYqH1np-cbJDUMiEb408F+OzroX0eJmEyAg@mail.gmail.com>

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