Question: How many indiana jones movies are there that had a prequel named indiana jones and the Raiders of the Lost Ark?
Answer(s):
answer: Indiana Jones and the Last Crusade

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.03ttl)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.03ttl ns:film.film_character.portrayed_in_films ?y .
?y ns:film.performance.film ?x .
?x ns:film.film.film_series ns:m.0hn_72f .
?x ns:film.film.prequel ns:m.0f4yh . 
}