asterisks in sort by threads

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Subject: asterisks in sort by threads
From: Dave Woodfall <dave@xxxxxxxxxxxxxxx>
Date: Tue, 28 Mar 2006 16:30:37 +0100
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What does an asterisk denote when sorting posts by threads? It looks a
little like

|-*>

-- 
Fortune's graffito of the week (or maybe even month):

                Don't Write On Walls!

                   (and underneath)

                You want I should type?

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