Question: What sports do people play in Poland that has a center in it's sports team roster?
Answer(s):
answer: Asseco Gdynia
answer: Basket Zielona Góra
answer: Basket Zielona Góra

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05qhw)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05qhw ns:sports.sports_team_location.teams ?x .
?x ns:sports.sports_team.roster ?c .
?c ns:sports.sports_team_roster.position ns:m.02_ssl . 
}