Question: Which countries have Arabic as their official language and armies numbering fewer than 20900?
Answer(s):
answer: Bahrain
answer: Mauritania
answer: Qatar
answer: Libya
answer: Lebanon
answer: Djibouti

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0jzc)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0jzc ns:language.human_language.countries_spoken_in ?x .
?x ns:location.country.official_language ns:m.0jzc .
?x ns:location.statistical_region.size_of_armed_forces ?c .
?c ns:measurement_unit.dated_integer.number ?num .
FILTER (xsd:integer(?num) < 20900) . 
}