Fix document error

     */

    void removeCourseSectionClass(int classId);

    List<Course> getAllCourses();

    /**

     * Return all satisfied CourseSections.

     * We will compare the all other fields in CourseSection besides the id.

     * @param courseId if the key is non-existent, please throw an EntityNotFoundException.

     * @param semesterId

     * @param semesterId if the key is non-existent, please throw an EntityNotFoundException.

     * @return

     */

    List<Course> getAllCourses();

    List<CourseSection> getCourseSectionsInSemester(String courseId, int semesterId);

    /**