which actor was casted in the most movies?
SELECT DISTINCT ?uri WHERE { ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Actor> . ?f <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Film> . ?f <http://dbpedia.org/ontology/starring> ?uri . } ORDER BY DESC(COUNT(DISTINCT(?f))) OFFSET 0 LIMIT 1