Who developed the programming languages designed by Rob Pike?
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/designer> <http://dbpedia.org/resource/Rob_Pike> . ?x <http://dbpedia.org/ontology/developer> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/ProgrammingLanguage>}
Rob_Pike