"Optical Mark Recognition (OMR)" . . "Optical mark recognition" . . . "(OMR)" . . . . "scanners" . "optical mark recognition (OMR)" . "optical mark recognition" . . "scanner" . . "optical marks" . . . "OMR" . "optical mark reading" . "automatically marked" . . "Optical mark recognition" . "Optical mark recognition#Optical answer sheet" . "optical scan" . "optically-marked" .