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