The individual structural member of {TAIL ~ the invention} includes a pair of {HEAD ~ parallel panels} which are spaced from each other to define a cavity therebetween 
The individual structural member of { TAIL ~ the invention } includes a pair of { HEAD ~ parallel panels } which are spaced from each other to define a cavity therebetween
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH