who is the broadcast artist of a radio program which was produced by national radio theatre?
Entity Entity Entity Entity Entity
m.02tkzn m.05mvfc m.0g4sfg m.085_gj m.0fm1gn
Ed Asner John Glover Irene Worth Barry Morse Shepperd Strudwick
class class entity
broadcast.artist radio.radio_program m.05v12bg
broadcast.artist radio.radio_program broadcast.producer
Broadcast Artist Radio program National Radio Theatre
none none none
broadcast.artist.content broadcast.content.producer
Content Producer
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.artist . 
?x1 :type.object.type :radio.radio_program . 
VALUES ?x2 { :m.05v12bg } 
?x0 :broadcast.artist.content ?x1 . 
?x1 :broadcast.content.producer ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND broadcast.artist (JOIN broadcast.artist.content (JOIN broadcast.content.producer m.05v12bg)))