Question: What is the river whose mouth locations are Arctic Ocean and Laptev Sea?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?uri prop:mouthLocation <http://dbpedia.org/resource/Arctic_Ocean> . ?uri prop:mouthLocation <http://dbpedia.org/resource/Laptev_Sea> . ?uri rdf:type onto:River}