which bi-propellant rocket engines use unsymmetrical dimethylhydrazine and have a dry mass of less than 980.0?
Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity
m.02xlty_ m.03hd3kq m.02xltxc m.02xlty5 m.02xlv54 m.02xlwcf m.02xlt_j m.02xltj2 m.02xltks m.02xltmg m.02xltn9 m.02xltsb m.02xlv3k m.02xlv4c m.02xlv7m m.02xlwk0 m.02xlwmh m.03hdfmx
RD-250 S5.19 RD-250M RD-250P RD-219 RD-119 RD-224D RD-273 RD-268 RD-263 RD-262 RD-252 RD-220 RD-219U RD-217U RD-112 RD-109 S5.92
class entity literal
spaceflight.bipropellant_rocket_engine m.017q1y 980.0^^http://www.w3.org/2001/XMLSchema#float
spaceflight.bipropellant_rocket_engine spaceflight.rocket_engine_fuel type.float
Bipropellant rocket engine Unsymmetrical dimethylhydrazine 980.0
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 < "980.0"^^<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 980.0^^http://www.w3.org/2001/XMLSchema#float)))