machine_question: who fought in the battle of vicksburg and the country capital is Richmond
question: Who fought in the battle of Vicksburg whose capital is Richmond?
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:location.country.capital ns:m.0dzt9 . 
  }
webqsp_question: who fought in the battle of vicksburg