Question: River which flows into the eugene mahoney state park pass through which states?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/property/mouthLocation> <http://dbpedia.org/resource/Eugene_T._Mahoney_State_Park> . ?x <http://dbpedia.org/ontology/state> ?uri  . }
Answer: [Nebraska] is the state of the stream whose mouth is in Eugene T. Mahoney State Park.