{HEAD ~ The apparatus} further includes {TAIL ~ an illumination system} for illuminating the interior of the hole 
{ HEAD ~ The apparatus } further includes { TAIL ~ an illumination system } for illuminating the interior of the hole
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH