Question: Find the producer of The Don Killuminati:The 7 Day Theory, what books did this producer write?
Answer(s):
answer: The Rose That Grew from Concrete
answer: The rose that grew from concrete
answer: Tupac
answer: Tupac
answer: Tupac

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:music.producer.releases_produced ns:m.032j348 . 
?c ns:book.author.book_editions_published ?x .
}