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