Were M1 and M2 edited and produced by a film 's prequel 's producer and editor
SELECT count(*) WHERE {
?x0 ns:film.editor.film ?x1 .
?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
?x1 ns:film.film.sequel ?x2 .
?x2 a ns:film.film .
M1 ns:film.film.edited_by ?x0 .
M1 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
M2 ns:film.film.edited_by ?x0 .
M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}