Were M3 and M4 written and directed by a film editor that M1 and M2 were directed by and edited by
SELECT count(*) WHERE {
?x0 a ns:film.editor .
?x0 ns:film.director.film M1 .
?x0 ns:film.director.film M2 .
?x0 ns:film.editor.film M1 .
?x0 ns:film.editor.film M2 .
M3 ns:film.film.directed_by ?x0 .
M3 ns:film.film.written_by ?x0 .
M4 ns:film.film.directed_by ?x0 .
M4 ns:film.film.written_by ?x0
}