The bars and spaces are arranged in a plurality of sequential groups defining {HEAD ~ respective characters} of {TAIL ~ equal width} 
of
The bars and spaces are arranged in a plurality of sequential groups defining { HEAD ~ respective characters } of { TAIL ~ equal width }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL