Question: What city is the headquarters that acquired the World Extreme Cagefighting company located in?
Answer(s):
answer: Las Vegas

SPARQL query:
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:organization.organization.companies_acquired ?k .
?k ns:business.acquisition.company_acquired ns:m.0fyxd0 . 
?c ns:organization.organization.headquarters ?y .
?y ns:location.mailing_address.citytown ?x .
}