Did a actor executive produce M3 's sequel and edit M1 and M2
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
?x0 ns:film.producer.films_executive_produced ?x1 .
?x1 ns:film.film.prequel M3
}