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