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