name the fossil specimen which has the organism of homo ergaster.
Entity
m.0fh1vv
KNM ER 992
class entity
biology.fossil_specimen m.01pd_y
biology.fossil_specimen biology.organism_classification
Fossil specimen Homo ergaster
none none
biology.fossil_specimen.organism
Organism
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 :biology.fossil_specimen . 
VALUES ?x1 { :m.01pd_y } 
?x0 :biology.fossil_specimen.organism ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND biology.fossil_specimen (JOIN biology.fossil_specimen.organism m.01pd_y))