Were M1 and M2 written and executive produced by a screenwriter
SELECT count(*) WHERE {
?x0 a ns:film.writer .
M1 ns:film.film.executive_produced_by ?x0 .
M1 ns:film.film.written_by ?x0 .
M2 ns:film.film.executive_produced_by ?x0 .
M2 ns:film.film.written_by ?x0
}