what is the unit of area that the measurement system that have an electric field strength units of volt per metre have?
Entity Entity
m.0jljd m.0bshsw
Square kilometer Square meter
class class entity
measurement_unit.area_unit measurement_unit.measurement_system m.02sj52k
measurement_unit.area_unit measurement_unit.measurement_system measurement_unit.electric_field_strength_unit
Unit of Area Measurement System Volt per metre
none none none
measurement_unit.measurement_system.area_units measurement_unit.measurement_system.electric_field_strength_units
Area Units Electric Field Strength Units
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 :measurement_unit.area_unit . 
?x1 :type.object.type :measurement_unit.measurement_system . 
VALUES ?x2 { :m.02sj52k } 
?x1 :measurement_unit.measurement_system.area_units ?x0 . 
?x1 :measurement_unit.measurement_system.electric_field_strength_units ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND measurement_unit.area_unit (JOIN (R measurement_unit.measurement_system.area_units) (JOIN measurement_unit.measurement_system.electric_field_strength_units m.02sj52k)))