Were M2 and M3 executive produced by a actor and written by a film editor
SELECT count(*) WHERE {
?x0 a ns:film.actor .
?x1 a ns:film.editor .
M2 ns:film.film.executive_produced_by ?x0 .
M2 ns:film.film.written_by ?x1 .
M3 ns:film.film.executive_produced_by ?x0 .
M3 ns:film.film.written_by ?x1
}