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