machine_question: what is the official language of the where the currency Ukrainian karbovanets is used
question: Where the currency, Ukrainian karbovanets, are used, what is the official language?
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.04l6w_ . 
  ?c ns:location.country.languages_spoken ?x .
  }
  
webqsp_question: what is the official language of the ukraine