Question: What is the former team of the american football players whose position is Running back?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:position <http://dbpedia.org/resource/Running_back> . ?x onto:formerTeam ?uri . ?x rdf:type onto:AmericanFootballPlayer}