the developer digital equipment corporation created which operating system?
Entity Entity Entity Entity Entity Entity Entity Entity Entity Entity
m.080ph m.01c6km m.01lpp9 m.01tl04 m.02_7mg3 m.02m0bc m.02w9vw9 m.09jt8 m.0gvm0 m.0j1sr
OpenVMS Ultrix OS/8 RSTS/E TRAX TOPS-10 DEC BATCH-11/DOS-11 Tru64 UNIX RSX-11 RT-11
class entity
computer.operating_system m.026v5
computer.operating_system computer.operating_system_developer
Operating System Digital Equipment Corporation
none none
computer.operating_system.developer
Developer
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 :computer.operating_system . 
VALUES ?x1 { :m.026v5 } 
?x0 :computer.operating_system.developer ?x1 . 
FILTER ( ?x0 != ?x1  )
}
}
(AND computer.operating_system (JOIN computer.operating_system.developer m.026v5))