{TAIL ~ A system} 9, wherein the plurality of pieces of mail includes at least one of a plurality of letters and a plurality of {HEAD ~ flats} 
{ TAIL ~ A system } 9 , wherein the plurality of pieces of mail includes at least one of a plurality of letters and a plurality of { HEAD ~ flats }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD