What is the {agent} for {used by} of {communication}
Which is the agent used to communicate?
Which is the agent that is used in communication?
SELECT DISTINCT ?r WHERE { resource:communication property:used_by ?r . ?r rdf:type ontology:agent }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q11024> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1535> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q24229398> } 
 select distinct ?obj where { wd:Q11024 wdt:P1535 ?obj . ?obj wdt:P31 wd:Q24229398 } 