This article is from the Robert Jordan FAQ, by John S. Novak, III jsn@concentric.net with numerous contributions by others.
Only keep as much of the previous post post as is necessary for
people to know what you are talking about. Summarize wherever
possible (i.e. instead of 20 lines of included text, summarize it
in a sentence). Make sure you attribute the right things to the
right people, and ALWAYS DELETE .sigs WHEN QUOTING. On the same
token, don't post a reply to a specific post without quoting or
summarizing at least some of it. The idea is to include *just
enough* context for people who have not seen the article to which
you are replying (which can happen quite frequently) to be able
to understand your comments.
 
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