Question: Who has an organization headquarters, located in Boston, as well as created Arthur?
Answer(s):
answer: WGBH

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0px0r)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0px0r ns:tv.tv_program.program_creator ?x .
?x ns:organization.organization.headquarters ?c .
?c ns:location.mailing_address.citytown ns:m.01cx_ . 
}