name the producer of the broadcast content with genre nature.
Entity
m.05xbx
PBS
class class entity
broadcast.producer broadcast.content m.03f8qxx
broadcast.producer broadcast.content broadcast.genre
Broadcast Producer Broadcast Content Nature
none none none
broadcast.content.producer broadcast.content.genre
Producer Genres
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX : <http://rdf.freebase.com/ns/> 
SELECT (?x0 AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :broadcast.producer . 
?x1 :type.object.type :broadcast.content . 
VALUES ?x2 { :m.03f8qxx } 
?x1 :broadcast.content.producer ?x0 . 
?x1 :broadcast.content.genre ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND broadcast.producer (JOIN (R broadcast.content.producer) (JOIN broadcast.content.genre m.03f8qxx)))