machine_question: what kind of economy was the where the currency Soviet ruble is used
question: What was the economic system in the country where the Soviet ruble was the currency?
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.025rymp . 
  ?c ns:location.country.form_of_government ?x .
  }
  
webqsp_question: what kind of economy was the soviet union