In the UPC symbology, {HEAD ~ a character} is defined as having {TAIL ~ two bars} 16 and two spaces 18 of varying widths 
is defined as having
In the UPC symbology , { HEAD ~ a character } is defined as having { TAIL ~ two bars } 16 and two spaces 18 of varying widths
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH