{HEAD ~ The light bulb} has {TAIL ~ three filaments} which separately emit white light upon selective illumination 
has
{ HEAD ~ The light bulb } has { TAIL ~ three filaments } which separately emit white light upon selective illumination
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH