{HEAD ~ Each hair retainer} has {TAIL ~ a pair} of opposing hinge ledges at one end portion thereof 
has
{ HEAD ~ Each hair retainer } has { TAIL ~ a pair } of opposing hinge ledges at one end portion thereof
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH