what bipropellant rocket engine use the fuel unsymmetrical dimethylhydrazine and has a dry mass less than 168.5?
Entity Entity
m.03hd3kq m.03hdfmx
S5.19 S5.92
class entity literal
spaceflight.bipropellant_rocket_engine m.017q1y 168.5^^http://www.w3.org/2001/XMLSchema#float
spaceflight.bipropellant_rocket_engine spaceflight.rocket_engine_fuel type.float
Bipropellant rocket engine Unsymmetrical dimethylhydrazine 168.5
none none <
spaceflight.bipropellant_rocket_engine.fuel spaceflight.rocket_engine.dry_mass
Fuel Dry mass
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.bipropellant_rocket_engine . 
VALUES ?x1 { :m.017q1y } 
FILTER (?x2 < "168.5"^^<http://www.w3.org/2001/XMLSchema#float>)
?x0 :spaceflight.bipropellant_rocket_engine.fuel ?x1 . 
?x0 :spaceflight.rocket_engine.dry_mass ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND spaceflight.bipropellant_rocket_engine (AND (JOIN spaceflight.bipropellant_rocket_engine.fuel m.017q1y) (lt spaceflight.rocket_engine.dry_mass 168.5^^http://www.w3.org/2001/XMLSchema#float)))