instruction: Is there anyone else who teaches Medieval Literature besides Prof. Navvab ?
response: SELECT DISTINCT course.department, course.name, course.number, instructor.name FROM course, course_offering, instructor, offering_instructor WHERE course.course_id = course_offering.course_id AND course.name LIKE '%Medieval Literature%' AND NOT instructor.name LIKE '%Navvab%' AND offering_instructor.instructor_id = instructor.instructor_id AND offering_instructor.offering_id = course_offering.offering_id