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