What are the first and last names of all customers with between 1000 and 3000 dollars outstanding?
return customers ;return dollars outstanding of  #1 ;return #1 where #2 is  at least 1000 ;return #1 where #2 is  at most 3000 ;return #1 of  both #3 and  #4 ;return first names of  #5 ;return last names of  #5 ;return #6 ,  #7
['select', 'project', 'comparative', 'comparative', 'intersection', 'project', 'project', 'union']