#       $NetBSD: merge.awk,v 1.1 2013/11/22 16:00:45 christos Exp $
#
#       @(#)merge.awk   8.3 (Berkeley) 5/25/94
#
# merge index entries into one line per label
$1 == prev {
       printf ", %s", $2;
       next;
}
{
       if (NR != 1)
               printf "\n";
       printf "%s \t%s", $1, $2;
       prev = $1;
}
END {
       printf "\n"
}