Was M1 written by M2 , directed by a screenwriter , and written by a screenwriter
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x1 a ns:film.writer .
M1 ns:film.film.directed_by ?x1 .
M1 ns:film.film.written_by ?x0 .
M1 ns:film.film.written_by M2
}