Question: Which books by Suzanne Collins were published before 2006?
Answer(s):
answer: Gregor The Overlander (Underland Chronicles)
answer: FIRE PROOF
answer: Gregor and the Prophecy of Bane (Underland Chronicles (Paperback))
answer: Gregor and the Prophecy of Bane
answer: Gregor the Overlander (Underland Chronicles (Sagebrush))
answer: The Underland Chronicles Book Three
answer: Gregor the Overlander (Underland Chronicles (Turtleback))
answer: When Charlie McButton lost power
answer: Gregor and the Curse of the Warmbloods
answer: Fire Proof
answer: Gregor the Overlander (Underland Chronicles)
answer: Gregor the Overlander
answer: Gregor and the Prophecy of Bane (Underland Chronicles (Turtleback))

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0bpd5z)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0bpd5z ns:book.author.book_editions_published ?x .
?x ns:book.book_edition.publication_date ?num .
FILTER (?num < "2006"^^xsd:dateTime) . 
}