Such a machine that is used to validate checks uses {HEAD ~ a stepper motor drive} to convey {TAIL ~ the check} past the readhead 
Such a machine that is used to validate checks uses { HEAD ~ a stepper motor drive } to convey { TAIL ~ the check } past the readhead
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH