Question: What language, having the Rosetta project code slk, is spoken in the Czech Republic?
Answer(s):
answer: Slovak Language

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.01mjq)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.01mjq ns:location.country.languages_spoken ?x .
?x ns:language.human_language.rosetta_project_code "slk" . 
}