Question: What cities does the river goes through, whose tributary is the little black river in Arkansas?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/leftTributary> <http://dbpedia.org/resource/Little_Black_River_(Missouri_-_Arkansas)> . ?x <http://dbpedia.org/ontology/city> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/River>}
Answer: The cities with the rivers whose left tributary is Little Black River are [Missouri, Doniphan, Missouri, Van Buren, Missouri].