{HEAD ~ a spring} for urging {TAIL ~ the second end portions} of the pair of hair retainers in a closing direction thereof, 
{ HEAD ~ a spring } for urging { TAIL ~ the second end portions } of the pair of hair retainers in a closing direction thereof ,
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH