What is the {tag editor} for {operating system} of {MS-DOS}
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Which is the tag editor of the operating system of MS-DOS?
SELECT DISTINCT ?m WHERE { ?m property:operating_system resource:MS-DOS . ?m rdf:type ontology:tag_editor }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P306> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q47604> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q240795> } 
 select distinct ?sbj where { ?sbj wdt:P306 wd:Q47604 . ?sbj wdt:P31 wd:Q240795 } 