What came before PlayStation 4 and uses PlayStation 3 system software as OS?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/successor> <http://dbpedia.org/resource/PlayStation_4> . ?uri <http://dbpedia.org/property/os> <http://dbpedia.org/resource/PlayStation_3_system_software>  . }
PlayStation_4 PlayStation_3_system_software