Which executive producer of M0 was M1 's sequel 's sequel 's executive producer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.producer.films_executive_produced M0 .
?x1 ns:film.film.prequel ?x2 .
?x2 ns:film.film.prequel M1
}