what kind of engine is a reaction engine?
Entity Entity Entity Entity Entity Entity
m.018vbw m.0q03_ m.06kgf m.01mx49 m.01bb83 m.0l1_6
Turbojet Turbofan Ramjet Rocket engine Motorjet Pulsejet
class entity
engineering.engine_category m.02psfn8
engineering.engine_category engineering.engine_category
Engine category Reaction engine
none none
engineering.engine_category.category_of
Category of
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.engine_category . 
VALUES ?x1 { :m.02psfn8 } 
?x0 :engineering.engine_category.category_of ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND engineering.engine_category (JOIN engineering.engine_category.category_of m.02psfn8))