which airline features a hub at nouakchott international airport?
Entity Entity Entity
m.03d5jx9 m.05829z m.0g5rky0
Mauritania Airways Air Mauritanie Mauritania Airlines International
class entity
aviation.airline m.0cbcp8
aviation.airline aviation.airport
Airline Nouakchott International Airport
none none
aviation.airline.hubs
Hubs
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 :aviation.airline . 
VALUES ?x1 { :m.0cbcp8 } 
?x0 :aviation.airline.hubs ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND aviation.airline (JOIN aviation.airline.hubs m.0cbcp8))