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