16 Course materials namely books, distance learning instructional materials, training manuals, operational manuals, brochures, pamphlets, and periodical publications all in the field of information technology , drawing rulers, office supplies, namely, pencil holders, pencil cases, erasers, binders, pens, pencils, loose leaf paper, markers, storage boxes of cardboard, letter racks and sorters, file folders, adhesive labels, adhesive tape for household and stationery use, staplers, rubber bands, paper clips, indexes, index cards, stationery, envelopes, pads, posters, notebooks, message pads, message pads, signs, and diaries