What are the names of all reviewers that have given 3 or 4 stars for reviews?
return reviewers ;return reviews of #1 ;return stars of #2 ;return number of  #3 for each  #2 ;return #1 where #4 is 3 ;return #1 where #4 is 4 ;return #1 in  both #5 and  #6 ;return names of #7
['select', 'project', 'project', 'group', 'comparative', 'comparative', 'intersection', 'project']