the artworks executed on copper sheet consist of how many?
Value
10
class entity
visual_art.artwork m.025rsfk
visual_art.artwork visual_art.visual_art_support
Artwork copper sheet
count none
visual_art.visual_art_support.artworks
Artworks
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 :visual_art.artwork . 
VALUES ?x1 { :m.025rsfk } 
?x1 :visual_art.visual_art_support.artworks ?x0 . 
FILTER ( ?x0 != ?x1  )
}
}
(COUNT (AND visual_art.artwork (JOIN (R visual_art.visual_art_support.artworks) m.025rsfk)))