This is {HEAD ~ the first distance} of {TAIL ~ travel} the temple may flex beyond its fully open, unbiased position on the eyewear 
This is { HEAD ~ the first distance } of { TAIL ~ travel } the temple may flex beyond its fully open , unbiased position on the eyewear
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH