Question: Which vice president was also the United States Secretary of the Air Force?
Answer(s):
answer: Dick Cheney

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:government.political_appointer.appointees ?k .
?k ns:government.government_position_held.office_position_or_title ns:m.01sf2h . 
?c ns:government.us_president.vice_president ?x .
}