The body member includes {HEAD ~ a cavity} on {TAIL ~ its first end} which terminates by an end wall at its second end 
on
The body member includes { HEAD ~ a cavity } on { TAIL ~ its first end } which terminates by an end wall at its second end
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH