RFC977 3.6.1.  LIST

   LIST

   Returns a list of valid newsgroups and associated information.  Each
   newsgroup is sent as a line of text in the following format:

      group last first p

   where <group> is the name of the newsgroup, <last> is the number of
   the last known article currently in that newsgroup, <first> is the
   number of the first article currently in the newsgroup, and <p> is
   either 'y' or 'n' indicating whether posting to this newsgroup is
   allowed ('y') or prohibited ('n').

   The <first> and <last> fields will always be numeric.  They may have
   leading zeros.  If the <last> field evaluates to less than the
   <first> field, there are no articles currently on file in the
   newsgroup.

   Note that posting may still be prohibited to a client even though the
   LIST command indicates that posting is permitted to a particular
   newsgroup. See the POST command for an explanation of client
   prohibitions.  The posting flag exists for each newsgroup because
   some newsgroups are moderated or are digests, and therefore cannot be
   posted to; that is, articles posted to them must be mailed to a
   moderator who will post them for the submitter.  This is independent
   of the posting permission granted to a client by the NNTP server.

   Please note that an empty list (i.e., the text body returned by this
   command consists only of the terminating period) is a possible valid
   response, and indicates that there are currently no valid newsgroups.

RFC977 3.6.2.  Responses

   215 list of newsgroups follows