ln --symbolic ../../bysemester/s13/ai.pdf  ../../byexam/ai/s13.pdf
#  ln --symbolic ../../bysemester/s13/ca.pdf  ../../byexam/ca/s13.pdf
 ln --symbolic ../../bysemester/s13/db.pdf  ../../byexam/db/s13.pdf
#  ln --symbolic ../../bysemester/s13/gr.pdf  ../../byexam/gr/s13.pdf
  ln --symbolic ../../bysemester/s13/fc.pdf  ../../byexam/fc/s13.pdf
  ln --symbolic ../../bysemester/s13/hci.pdf  ../../byexam/hci/s13.pdf
#  ln --symbolic ../../bysemester/s13/mp.pdf  ../../byexam/mp/s13.pdf
# ln --symbolic ../../bysemester/s13/na.pdf  ../../byexam/na/s13.pdf
 ln --symbolic ../../bysemester/s13/net.pdf   ../../byexam/net/s13.pdf
 ln --symbolic ../../bysemester/s13/opt.pdf   ../../byexam/opt/s13.pdf
 ln --symbolic ../../bysemester/s13/os.pdf  ../../byexam/os/s13.pdf
 ln --symbolic ../../bysemester/s13/pl.pdf   ../../byexam/pl/s13.pdf