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