{TAIL ~ The switch assembly} has {HEAD ~ three switches}, each of which selectively illuminates one of the filaments 
{ TAIL ~ The switch assembly } has { HEAD ~ three switches } , each of which selectively illuminates one of the filaments
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH