Question: What country, whose calling code is 421, did Czechoslovakia become?
Answer(s):
answer: Slovakia

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.01mk6)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.01mk6 ns:base.datedlocationtest.dated_location_test.broke_up_into ?y .
?y ns:base.datedlocationtest.dated_location_break_up.new_locations ?x .
?x ns:location.country.calling_code "421" . 
}