{TAIL ~ A display apparatus} includes {HEAD ~ an image source}, an eye position detector, and a combiner, that are aligned to a users eye 
{ TAIL ~ A display apparatus } includes { HEAD ~ an image source } , an eye position detector , and a combiner , that are aligned to a users eye
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH