machine_question: what was the sports team arena stadium is Old Trafford first name
question: What is the name of the sports team that owns Old Trafford Stadium?
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.sports_team.arena_stadium ns:m.030lpl . 
  ?c ns:sports.sports_team.previously_known_as ?x .
  }
  
webqsp_question: what was manchester united first name