machine_question: where do the houston rockets play basketball and is the structure opened in 1975
question: What venue was opened in 1975 and is where the Houston Rockets play their basketball games?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.0jmfb)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.0jmfb ns:sports.sports_team.arena_stadium ?x .
  ?x ns:architecture.structure.opened "1975"^^xsd:dateTime . 
  }
webqsp_question: where do the houston rockets play basketball