name the rocket engine with the height of 3.9.
Entity Entity Entity
m.02xlw89 m.02xlw3z m.02xlw4p
RD-123 RD-129 RD-128
class literal
spaceflight.rocket_engine 3.9^^http://www.w3.org/2001/XMLSchema#float
spaceflight.rocket_engine type.float
Rocket engine 3.9
none none
spaceflight.rocket_engine.height
Height
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 :spaceflight.rocket_engine . 
VALUES ?x1 { "3.9"^^<http://www.w3.org/2001/XMLSchema#float> } 
?x0 :spaceflight.rocket_engine.height ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND spaceflight.rocket_engine (JOIN spaceflight.rocket_engine.height 3.9^^http://www.w3.org/2001/XMLSchema#float))