{HEAD ~ The present invention} relates to the field of postal handling, processing, and delivery and, more particularly, to detecting {TAIL ~ contents} of letters, flats, packages, or other mail 
relates to detecting
{ HEAD ~ The present invention } relates to the field of postal handling , processing , and delivery and , more particularly , to detecting { TAIL ~ contents } of letters , flats , packages , or other mail
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH