Question: Which language is most spoken, where the currency used in the country is the Afghan afghani?
Answer(s):
answer: Farsi, Eastern Language
answer: Pashto language

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:location.country.currency_used ns:m.019vxc . 
?c ns:location.country.languages_spoken ?x .
}