What are the famous titles of artists who have not only had volumes that spent more than 2 weeks on top but also volumes that spent less than 2 weeks on top?
select t1.famous_title from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id where t2.weeks_on_top > 2 intersect select t1.famous_title from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id where t2.weeks_on_top < 2