Question: Which countries that are a part of NAFTA have a population smaller than 39939271?
Answer(s):
answer: Canada
answer: Mexico

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.05jj_)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.05jj_ ns:organization.membership_organization.members ?y .
?y ns:organization.organization_membership.member ?x .
?x ns:common.topic.notable_types ns:m.01mp .
?x ns:topic_server.population_number ?num .
FILTER (xsd:integer(?num) < 39939271) . 
}