Question: Find the first and last name of the staff members who reported problems from the product "rem" but not "aut"?
SQL: SELECT T3.staff_first_name ,  T3.staff_last_name FROM problems AS T1 JOIN product AS T2 JOIN staff AS T3 ON T1.product_id  =  T2.product_id AND T1.reported_by_staff_id  =  T3.staff_id WHERE T2.product_name  =  "rem" EXCEPT SELECT T3.staff_first_name ,  T3.staff_last_name FROM problems AS T1 JOIN product AS T2 JOIN staff AS T3 ON T1.product_id  =  T2.product_id AND T1.reported_by_staff_id  =  T3.staff_id WHERE T2.product_name  =  "aut"