What film starred M1 , M2 , and M3
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.starring/ns:film.performance.actor M1 .
?x0 ns:film.film.starring/ns:film.performance.actor M2 .
?x0 ns:film.film.starring/ns:film.performance.actor M3
}