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Bart Bailey wrote:

invisible text

Please don't precede your comment with a '--' at the start
of the line; this makes the text a signature or inline
attachment and prevents its being quoted in followups in
some news readers. It can also render this text invisible
in some graphical newsreaders.

In this case it makes it look like the followup is empty
of content and merely quotes the original post ;)

Regards,

Michael