Was a film that was written by and starred M2 and M3 M0
SELECT count(*) WHERE {
M0 a ns:film.film .
M0 ns:film.film.starring/ns:film.performance.actor M2 .
M0 ns:film.film.starring/ns:film.performance.actor M3 .
M0 ns:film.film.written_by M2 .
M0 ns:film.film.written_by M3
}