16 Printed books in the fields of computers, computer software, energy, electricity, and power systems; printed booklets in the fields of computers, computer software, energy, electricity, and power systems; printed magazines in the fields of computers, computer software, energy, electricity, and power systems; printed periodicals in the fields of computers, computer software, energy, electricity, and power systems; printed catalogues in the fields of computers, computer software, energy, electricity, and power systems; printed pamphlets in the fields of computers, computer software, energy, electricity, and power systems; printed posters; printed pictorial magazines in the fields of computers, computer software, energy, electricity, and power systems; signboards of paper or cardboard; wrapping paper; semi-finished business card paper; file folders; envelope papers; printed newsletters in the fields of computers, computer software, energy, electricity, and power systems; printed plans; printed handbook manuals in the fields of computers, computer software, energy, electricity, and power systems; note paper; envelopes; printed teaching materials, except apparatus, in the fields of computers, computer software, energy, electricity, and power systems; advertisement signboards of paper or cardboard