Question: What area with less than 646 population did the Battle of Antietam Creek take place?
Answer(s):
answer: Sharpsburg

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0lkxb)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0lkxb ns:time.event.locations ?x .
?x ns:topic_server.population_number ?num .
FILTER (xsd:integer(?num) < 646) . 
}