name the star system which has the constellation of equuleus.
Entity
m.08sh06
Alpha Equulei
class entity
astronomy.star_system m.02nn7
astronomy.star_system astronomy.constellation
Star System Equuleus
none none
astronomy.star_system.constellation
Constellation
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 :astronomy.star_system . 
VALUES ?x1 { :m.02nn7 } 
?x0 :astronomy.star_system.constellation ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND astronomy.star_system (JOIN astronomy.star_system.constellation m.02nn7))