Question: What area has the panama canal and the calling code 507?
Answer(s):
answer: Panama

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.066rl)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.066rl ns:location.location.containedby ?x .
?x ns:location.country.calling_code "507" . 
}