machine_question: where do the the sports team owner is Thomas S. Ricketts play
question: What stadium does the sports team owned by Thomas S. Ricketts play at?
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:sports.professional_sports_team.owner_s ns:m.04jf15w . 
  ?c ns:sports.sports_team.arena_stadium ?x .
  }
  
webqsp_question: where do the chicago cubs play