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