in harry graf kessler's opera the musical voice that's used as a character voice with mezzo soprano is?
Entity Entity
m.0j210 m.0l14wj
Soprano Contralto
class class entity class entity
music.voice opera.opera_character_voice m.018l5l opera.opera m.02x5gx_
music.voice opera.opera_character_voice music.voice opera.opera opera.librettist
Musical voice Opera character voice mezzo soprano Opera Harry Graf Kessler
none none none none none
opera.opera_character_voice.voice opera.opera_character_voice.voice opera.opera.characters opera.opera.librettist
Voice Voice Characters 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 :music.voice . 
?x1 :type.object.type :opera.opera_character_voice . 
VALUES ?x2 { :m.018l5l } 
?x3 :type.object.type :opera.opera . 
VALUES ?x4 { :m.02x5gx_ } 
?x1 :opera.opera_character_voice.voice ?x0 . 
?x1 :opera.opera_character_voice.voice ?x2 . 
?x3 :opera.opera.characters ?x1 . 
?x3 :opera.opera.librettist ?x4 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x0 != ?x3 && ?x0 != ?x4 && ?x1 != ?x2 && ?x1 != ?x3 && ?x1 != ?x4 && ?x2 != ?x3 && ?x2 != ?x4 && ?x3 != ?x4  )
}
}
(AND music.voice (JOIN (R opera.opera_character_voice.voice) (AND (JOIN opera.opera_character_voice.voice m.018l5l) (JOIN (R opera.opera.characters) (JOIN opera.opera.librettist m.02x5gx_)))))