which models of automobile has a sister model of buick roadmaster estate wagon?
Entity Entity
m.01pww0 m.024gsm
Chevrolet Impala Chevrolet Caprice
class entity
automotive.model m.047n4x
automotive.model automotive.model
Automobile Model buick roadmaster estate wagon
none none
automotive.model.similar
Sister Models
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 :automotive.model . 
VALUES ?x1 { :m.047n4x } 
?x0 :automotive.model.similar ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND automotive.model (JOIN automotive.model.similar m.047n4x))