Who produced a film 's prequel and sequel and produced M1
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:people.person .
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x1 ns:film.film.prequel ?x2 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film
}