machine_question: who fought in the battle of vicksburg and died from Esophageal cancer
question: Which of the combattants in the Battle of Vicksburg died as a result of esophageal cancer?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.01hf7f)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.01hf7f ns:base.culturalevent.event.entity_involved ?x .
  ?x ns:people.deceased_person.cause_of_death ns:m.01k9gb . 
  }
webqsp_question: who fought in the battle of vicksburg