What is the {mass murder} for {immediate cause of} of {War on Terror}
Which mass murder is the immediate cause of War on Terror?
SELECT DISTINCT ?u WHERE { ?u rdf:type ontology:mass_murder . ?u property:immediate_cause_of resource:War_on_Terror }
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/P1536> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q185729> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q750215> } 
 select distinct ?sbj where { ?sbj wdt:P1536 wd:Q185729 . ?sbj wdt:P31 wd:Q750215 } 
September 11 attacks