how many ways did scientists use to find dwarf planet pluto?
Value
2
class entity
astronomy.astronomical_discovery_technique m.0c3qy
astronomy.astronomical_discovery_technique astronomy.plutoid
Astronomical Discovery Technique dwarf planet pluto
count none
astronomy.astronomical_discovery.discovery_technique
Discovery Technique
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 (COUNT(?x0) AS ?value) WHERE {
SELECT DISTINCT ?x0  WHERE { 
?x0 :type.object.type :astronomy.astronomical_discovery_technique . 
VALUES ?x1 { :m.0c3qy } 
?x1 :astronomy.astronomical_discovery.discovery_technique ?x0 . 
FILTER ( ?x0 != ?x1  )
}
}
(COUNT (AND astronomy.astronomical_discovery_technique (JOIN (R astronomy.astronomical_discovery.discovery_technique) m.0c3qy)))