Was M3 written by and directed by a person that played M1 and M2
SELECT count(*) WHERE {
?x0 a ns:people.person .
?x0 ns:film.actor.film/ns:film.performance.character M1 .
?x0 ns:film.actor.film/ns:film.performance.character M2 .
M3 ns:film.film.directed_by ?x0 .
M3 ns:film.film.written_by ?x0
}