Question: Which islands with country calling code of 508 have mountains that are part of the Appalachian mountain chain?
Answer(s):
answer: Saint Pierre and Miquelon

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0lm0n)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0lm0n ns:location.location.partially_containedby ?x .
?x ns:location.country.calling_code "508" . 
}