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?
return volumes  ;return weeks  spent  on top of #1 ;return number of  #2 for each #1 ;return #1 where #3 is higher than 2  weeks  ;return #1 where #3 is lower than 2  weeks  ;return artists of both #4 and  #5 ;return famous titles of #6
['select', 'project', 'group', 'comparative', 'comparative', 'intersection', 'project']