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