According to another object of {TAIL ~ the invention}, the middle member comprises a sandwich of wire trusses and {HEAD ~ polystyrene materials} 
According to another object of { TAIL ~ the invention } , the middle member comprises a sandwich of wire trusses and { HEAD ~ polystyrene materials }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD