Name the sea whose inflow is Kemijoki and outflow is Danish straits?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/inflow> <http://dbpedia.org/resource/Kemijoki> . ?uri <http://dbpedia.org/property/outflow> <http://dbpedia.org/resource/Danish_straits>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Sea>}
Kemijoki Danish_straits