{HEAD ~ The light source} is capable of sending {TAIL ~ a light} to the light receiving means of the editing wheel 
{ HEAD ~ The light source } is capable of sending { TAIL ~ a light } to the light receiving means of the editing wheel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH