machine_question: where does river that flows through Volgograd start
question: Where does the river that flows through Volgograd start?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ?c)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ?c ns:geography.river.cities ns:m.07_h1 . 
  ?c ns:geography.river.origin ?x .
  }
  
webqsp_question: where does volga river start