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From: Harry Putnam <reader@newsguy.com>
Subject: Remove ghost groups
Date: Wed, 20 May 2020 09:59:52 -0400
Organization: Still searching...
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I have developed a number of what might be called ghost groups.  Some
(most) are as the result of removing groups behind gnus back. Others,
I'm not sure of their origin.

These groups now appear in gnus -> groups buffer with an asterisk
before them as in the included image below.

They do not respond to simple C-k nor do they respond to C-u G del

How can I get rid of them?