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