The method 2 wherein the composite film is wrapped around a pipe containing {HEAD ~ a volume} of {TAIL ~ water} 
of
The method 2 wherein the composite film is wrapped around a pipe containing { HEAD ~ a volume } of { TAIL ~ water }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL