{TAIL ~ The reflection board} can be located adjacent and extend along the one flat surface of {HEAD ~ the light guide} 
{ TAIL ~ The reflection board } can be located adjacent and extend along the one flat surface of { HEAD ~ the light guide }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD