{HEAD ~ A temple endpiece} includes a set of {TAIL ~ recesses} that engage the projections formed on the lens 
{ HEAD ~ A temple endpiece } includes a set of { TAIL ~ recesses } that engage the projections formed on the lens
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH