RR rr, rrr, rrrr, rre, rrna, rrd, rrb, rro, rrt, rra, rrx, rrp RR. There are any references about RR in here. you can look below. rrrr rrrrrr rrrrrrrr rrerre rrnarrna rrdrrd rrbrrb rrorro rrtrrt rrarra rrxrrx rrprrprr, rrr, rrrr, rre, rrna, rrd, rrb, rro, rrt, rra, rrx, rrp