{TAIL ~ The method} 1 wherein {HEAD ~ the fluorocarbon constituent} A of the blowing agent mixture is octafluorocyclobutane 
{ TAIL ~ The method } 1 wherein { HEAD ~ the fluorocarbon constituent } A of the blowing agent mixture is octafluorocyclobutane
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH