ln --symbolic ../../bysemester/f13/ai.pdf  ../../byexam/ai/f13.pdf
  ln --symbolic ../../bysemester/f13/ca.pdf  ../../byexam/ca/f13.pdf
  ln --symbolic ../../bysemester/f13/db.pdf  ../../byexam/db/f13.pdf
  ln --symbolic ../../bysemester/f13/fc.pdf  ../../byexam/fc/f13.pdf
  ln --symbolic ../../bysemester/f13/gr.pdf  ../../byexam/gr/f13.pdf
  ln --symbolic ../../bysemester/f13/hci.pdf  ../../byexam/hci/f13.pdf
  ln --symbolic ../../bysemester/f13/net.pdf  ../../byexam/net/f13.pdf
  ln --symbolic ../../bysemester/f13/mp.pdf  ../../byexam/mp/f13.pdf
# ln --symbolic ../../bysemester/f13/na.pdf  ../../byexam/na/f13.pdf
  ln --symbolic ../../bysemester/f13/os.pdf  ../../byexam/os/f13.pdf
#  ln --symbolic ../../bysemester/f13/pl.pdf   ../../byexam/pl/f13.pdf