What is the {copolymer} for {polymer of} of {ethylene}
Name a copolymer of ethylene.
 select distinct ?sbj where { ?sbj wdt:P4600 wd:Q151313 . ?sbj wdt:P31 wd:Q421281 } 
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4600> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q151313> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q421281> } 
What is a copolymer of ethylene?