Count all american football players whose former team owns Lucas Oil Stadium ?
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/city> <http://dbpedia.org/resource/Lucas_Oil_Stadium> . ?uri <http://dbpedia.org/ontology/formerTeam> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AmericanFootballPlayer>}
Lucas_Oil_Stadium