machine_question: what magazine did edgar allan poe work for and publication end date after 1841
question: What magazine did Edgar Allen Poe work for after 1841?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.02lt8)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.02lt8 ns:book.periodical_editor.periodicals_edited ?y .
  ?y ns:book.editorial_tenure.periodical ?x .
  ?x ns:book.magazine.place_of_publication ?c .
  ?c ns:book.place_of_publication_period.to ?num .
  FILTER (?num > "1841"^^xsd:dateTime) . 
  }
webqsp_question: what magazine did edgar allan poe work for