ln --symbolic ../../bysemester/s15/ai.pdf  ../../byexam/ai/s15.pdf
  ln --symbolic ../../bysemester/s15/ca.pdf  ../../byexam/ca/s15.pdf
#  ln --symbolic ../../bysemester/s15/db.pdf  ../../byexam/db/s15.pdf
  ln --symbolic ../../bysemester/s15/fc.pdf  ../../byexam/fc/s15.pdf
  ln --symbolic ../../bysemester/s15/gr.pdf  ../../byexam/gr/s15.pdf
  ln --symbolic ../../bysemester/s15/hci.pdf  ../../byexam/hci/s15.pdf
  ln --symbolic ../../bysemester/s15/mp.pdf  ../../byexam/mp/s15.pdf
  ln --symbolic ../../bysemester/s15/net.docx  ../../byexam/net/s15.docx
# ln --symbolic ../../bysemester/s15/na.pdf  ../../byexam/na/s15.pdf
 ln --symbolic ../../bysemester/s15/os.pdf  ../../byexam/os/s15.pdf
# ln --symbolic ../../bysemester/s15/pl.pdf   ../../byexam/pl/s15.pdf