Question: In what Sports facility home to the do the Celtics do the Hartford Whalers also play?
Answer(s):
answer: XL Center

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0bwjj)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0bwjj ns:sports.sports_team.arena_stadium ?x .
?x ns:sports.sports_facility.home_venue_for ?c .
?c ns:sports.team_venue_relationship.team ns:m.01nvls . 
}