machine_question: what kind of government does poland have and is the topic that the speaker Nelson Mandela talked about
question: What government system does Poland use that Nelson Mandela has talked about?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.05qhw)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.05qhw ns:location.country.form_of_government ?x .
  ?x ns:event.speech_topic.speeches_or_presentations_on_this_topic ?c .
  ?c ns:event.speech_or_presentation.speaker_s ns:m.05g7q . 
  }
webqsp_question: what kind of government does poland have