public static function setAvailableStudents(ExaminationRepprovedSubject $examination_repproved_subject)
 {
     self::$_students_repproved_course_subject = array_merge($examination_repproved_subject->getStudents(), SchoolBehaviourFactory::getInstance()->getAvailableStudentsForExaminationRepprovedSubject($examination_repproved_subject));
 }