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