{HEAD ~ A frame} of {TAIL ~ a pair} of glasses has a pair of eye rims with front surface and nasal regions which are connected together by a bridge with a front surface and a nasal region 
of
{ HEAD ~ A frame } of { TAIL ~ a pair } of glasses has a pair of eye rims with front surface and nasal regions which are connected together by a bridge with a front surface and a nasal region
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH