Which staff members who reported problems from the product "rem" but not "aut"? Give me their first and last names.
return staff members ;return problems that #1 reported ;return products of #2 ;return #1 where #3 is rem ;return #4 where #3 is aut ;return #4 besides  #5 ;return first names of #6 ;return last names of #6 ;return #7 ,  #8
['select', 'project', 'project', 'comparative', 'comparative', 'discard', 'project', 'project', 'union']