i think a couple of options would be nice.
if your user number is over 30 either siplay like you said, show all the users that start with a.
or maybe direct groups, if you know the names of the users pop them here, followed by a comma.
or search box show all the users that have "an" in there username.
or by how many posts they have, sometimes the users that are upgraded users have way more posts than the normal ones.
or users who have registered between these dates.
i don't really know, i don't use the groups that much. just ideas.
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