What was a film whose prequel starred M1 and M2 and was written by M3 and M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.film .
?x0 ns:film.film.prequel ?x1 .
?x1 ns:film.film.starring/ns:film.performance.actor M1 .
?x1 ns:film.film.starring/ns:film.performance.actor M2 .
?x1 ns:film.film.written_by M3 .
?x1 ns:film.film.written_by M4
}