A system includes {TAIL ~ a speed control module}, a repeatable component measuring module, and {HEAD ~ a repeatable component correcting module} 
A system includes { TAIL ~ a speed control module } , a repeatable component measuring module , and { HEAD ~ a repeatable component correcting module }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD