classes:  lecturer. after the 30th fraction 4 - 1 fraction 5 doubledot lecturers do not come to class to teach.  curriculum. after the 30th fraction 4 - 1 fraction 5 doubledot lecturers do not come to class to teach.  facility. after the 30th fraction 4 - 1 fraction 5 doubledot lecturers do not come to class to teach.  general. after the 30th fraction 4 - 1 fraction 5 doubledot lecturers do not come to class to teach.