Were M2 and M3 executive produced by and written by a film producer that M1 was executive produced by
SELECT count(*) WHERE {
?x0 a ns:film.producer .
?x0 ns:film.producer.films_executive_produced M1 .
M2 ns:film.film.executive_produced_by ?x0 .
M2 ns:film.film.written_by ?x0 .
M3 ns:film.film.executive_produced_by ?x0 .
M3 ns:film.film.written_by ?x0
}