These switches are used in conjunction with appropriate circuitry to make sure {TAIL ~ a minimum copy length} is achieved even though the original document may not have {HEAD ~ a length} that is equal to the minimum required 
These switches are used in conjunction with appropriate circuitry to make sure { TAIL ~ a minimum copy length } is achieved even though the original document may not have { HEAD ~ a length } that is equal to the minimum required
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH