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