Question: What are the drugs that Charlie Harper has done?
Answer(s):
answer: Cocaine
answer: Ethanol
answer: Lysergic acid diethylamide
answer: Cannabis

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:award.award_nominee.award_nominations ?k .
?k ns:award.award_nomination.nominated_for ns:m.04cxdrv . 
?c ns:base.popstra.celebrity.substance_abuse ?y .
?y ns:base.popstra.substance_abuse.substance ?x .
}