Question: Through how many cities does the river flowing into Arkansas go?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:mouthMountain <http://dbpedia.org/resource/Arkansas> . ?x onto:city ?uri  . ?uri rdf:type onto:City}