said polymeric material is selected from {HEAD ~ a group} consisting of {TAIL ~ polypropylene}, polyethylene, and nylon 
consisting of
said polymeric material is selected from { HEAD ~ a group } consisting of { TAIL ~ polypropylene } , polyethylene , and nylon
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH