cor-ten steel and what other materials are in the same class?
Entity Entity Entity Entity Entity Entity Entity Entity
m.0fvrsk m.06qqv m.02yxm_ m.065zbvt m.04wl9d m.03qrct3 m.02yxpg m.010vv6qw
Alloy steel Stainless steel Carbon steel Deoxidized steel Maraging steel Galvanized steel Tool steel MS Pipe, MS Tube
class class entity
engineering.material engineering.material m.08g_fq
engineering.material engineering.material engineering.material
Material Material cor-ten steel
none none none
engineering.material.subclass engineering.material.parent_material_class
Child material class Parent 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 . 
?x1 :type.object.type :engineering.material . 
VALUES ?x2 { :m.08g_fq } 
?x1 :engineering.material.subclass ?x0 . 
?x2 :engineering.material.parent_material_class ?x1 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND engineering.material (JOIN (R engineering.material.subclass) (JOIN (R engineering.material.parent_material_class) m.08g_fq)))