Which prequel of M0 did a writer of M1 and M2 produce
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.film.produced_by|ns:film.film.production_companies ?x1 .
?x0 ns:film.film.sequel M0 .
?x1 ns:film.writer.film M1 .
?x1 ns:film.writer.film M2
}