{HEAD ~ The second material} for {TAIL ~ the outer core}, preferably polyurethane foam, consists of 100 parts of a resin mixture, a blowing agent, and either 51 or 60 parts isocyanate 
{ HEAD ~ The second material } for { TAIL ~ the outer core } , preferably polyurethane foam , consists of 100 parts of a resin mixture , a blowing agent , and either 51 or 60 parts isocyanate
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH