machine_question: what is where the currency South Korean won is used  's capital city
question: What's the capital city of the place where the currency the South Korean won is used?
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:location.country.currency_formerly_used ns:m.026wbvz . 
  ?c ns:location.country.capital ?x .
  }
  
webqsp_question: what is south korea 's capital city