If there is a person behind the counter of a bookstore that has at least four separate bookshelves.
return bookstores ;return separate bookshelves of  #1 ;return number of #2 for each #1 ;return #1 where #3 is  at least four ;return the  counter of  #4 ;return if  there is  a  person behind of  #5
['select', 'project', 'group', 'comparative', 'project', 'boolean']