a child material class of 6061 aluminium alloy is had by what material?
Entity
m.027vj2v
Aluminium
class entity
engineering.material m.0261kyp
engineering.material engineering.material
Material 6061 aluminium alloy
none none
engineering.material.subclass
Child material class
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 :engineering.material . 
VALUES ?x1 { :m.0261kyp } 
?x0 :engineering.material.subclass ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND engineering.material (JOIN engineering.material.subclass m.0261kyp))