what is the name of the observatory that has a telescope platform of mountain peak?
Entity
m.022tzk
Palomar Observatory
class class entity
astronomy.astronomical_observatory astronomy.telescope m.0388sn
astronomy.astronomical_observatory astronomy.telescope astronomy.telescope_platform
Astronomical Observatory Telescope mountain peak
none none none
astronomy.astronomical_observatory.telescope_s astronomy.telescope.operational_platform
Telescope(s) Operational platform
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.astronomical_observatory . 
?x1 :type.object.type :astronomy.telescope . 
VALUES ?x2 { :m.0388sn } 
?x0 :astronomy.astronomical_observatory.telescope_s ?x1 . 
?x1 :astronomy.telescope.operational_platform ?x2 . 
FILTER ( ?x0 != ?x1 && ?x0 != ?x2 && ?x1 != ?x2  )
}
}
(AND astronomy.astronomical_observatory (JOIN astronomy.astronomical_observatory.telescope_s (JOIN astronomy.telescope.operational_platform m.0388sn)))