machine_question: what year did the baltimore ravens win superbowl and is the event ended after 2001-01-28
question: Which Superbowl after January 2001 did the Baltimore Ravens win?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.01ct6)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.01ct6 ns:sports.sports_team.championships ?x .
  ?x ns:sports.sports_championship_event.championship ns:m.06x5s .
  ?x ns:time.event.end_date ?num .
  FILTER (?num > "2001-01-28"^^xsd:dateTime) . 
  }
webqsp_question: what year did the baltimore ravens win superbowl