What are the album titles for albums containing both 'Reggae' and 'Rock' genre tracks?
return albums ;return tracks of #1 ;return genres of #2 ;return #1 where #3 is 'Rock ;return #1 where #3 is 'Reggae ;return #1 in  both #4 and  #5 ;return album titles of #6
['select', 'project', 'project', 'comparative', 'comparative', 'intersection', 'project']