Did a producer and editor of M0 and M1 executive produce M2 's sequel
SELECT count(*) WHERE {
?x0 ns:film.editor.film M0 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.producer.films_executive_produced ?x1 .
?x0 ns:film.producer.film|ns:film.production_company.films M0 .
?x0 ns:film.producer.film|ns:film.production_company.films M1 .
?x1 ns:film.film.prequel M2
}