Question: Which films written by David Koepp were directed by Ron Howard?
Answer(s):
answer: The Paper
answer: Angels & Demons

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0g2lq)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0g2lq ns:film.director.film ?x .
?x ns:film.film.written_by ns:m.02x_m1 . 
}