further wherein {TAIL ~ said elongated mating member} includes {HEAD ~ a closed sectional structure portion} which is comprised of 
further wherein { TAIL ~ said elongated mating member } includes { HEAD ~ a closed sectional structure portion } which is comprised of
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH