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