Find the names of items whose rank is higher than 3 and whose average rating is above 5.
select t1.title from item as t1 join review as t2 on t1.i_id = t2.i_id where t2.rank > 3 intersect select t1.title from item as t1 join review as t2 on t1.i_id = t2.i_id group by t2.i_id having avg(t2.rating) > 5