What is the former team of the football player who is the coach of 2006 Oakland Raiders season ?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/2006_Oakland_Raiders_season> <http://dbpedia.org/property/coach> ?x . ?x <http://dbpedia.org/ontology/formerTeam> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/AmericanFootballPlayer>}
2006_Oakland_Raiders_season