Question: What political system is shared by Argentina and Brazil?
Answer(s):
answer: Presidential system
answer: Constitutional republic
answer: Federal republic

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0jgd)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0jgd ns:location.country.form_of_government ?x .
?x ns:government.form_of_government.countries ns:m.015fr . 
}