Question: Which U.S. state has the abbreviation MN?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX yago: <http://dbpedia.org/class/yago/>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT DISTINCT ?uri 
WHERE {
	?uri rdf:type yago:StatesOfTheUnitedStates .
        ?uri prop:postalabbreviation 'MN'@en .
}