Question: For how many teams have the league players of Czech Extraliga, previously played?
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/league> <http://dbpedia.org/resource/Czech_Extraliga> . ?x <http://dbpedia.org/ontology/formerTeam> ?uri  . }
Answer: The league players of Czech Extraliga, previously played for [499] teams.