first subject), `unread' (place point on the subject line of the first
unread article), `best' (place point on the subject line of the
higest-scored article), `unseen' (place point on the subject line of
-the first unseen article), 'unseen-or-unread' (place point on the subject
+the first unseen article), `unseen-or-unread' (place point on the subject
line of the first unseen article or, if all article have been seen, on the
subject line of the first unread article), or a function to be called to
place point on some subject line."