{HEAD ~ The characters} and graphics transmitted through a data channel are displayed clearly to the viewer by {TAIL ~ an ingenious technique} devised for displaying characters and graphics of a supplementary program 
are displayed clearly by
{ HEAD ~ The characters } and graphics transmitted through a data channel are displayed clearly to the viewer by { TAIL ~ an ingenious technique } devised for displaying characters and graphics of a supplementary program
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH