{HEAD ~ Exemplary types} of polymers include polystyrenes, {TAIL ~ polyvinyl chlorides}, polyesters, polyethylene terephthalates, low density polyethylenes, polypropylenes, apolyamides, acrylonitrite butadiene styrenes, polycarbonates, polycarbonate/acrylonitrite butadiene styrene blends, polyurethanes, melamine formaldehydes, plastics, and elastomeric plastics 
include
{ HEAD ~ Exemplary types } of polymers include polystyrenes , { TAIL ~ polyvinyl chlorides } , polyesters , polyethylene terephthalates , low density polyethylenes , polypropylenes , apolyamides , acrylonitrite butadiene styrenes , polycarbonates , polycarbonate / acrylonitrite butadiene styrene blends , polyurethanes , melamine formaldehydes , plastics , and elastomeric plastics
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH