which opera has the librettist of arturo rossato?
Entity Entity Entity
m.04lg1f6 g.15dqm6pd m.0279vhv
I cavalieri di Ekebù Giulietta e Romeo La farsa amorosa
class entity
opera.opera g.12lngr81m
opera.opera opera.librettist
Opera Arturo Rossato
none none
opera.opera.librettist
Librettist
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 :opera.opera . 
VALUES ?x1 { :g.12lngr81m } 
?x0 :opera.opera.librettist ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND opera.opera (JOIN opera.opera.librettist g.12lngr81m))