Were M2 and M4 edited by a screenwriter employed by M1 and executive produced by M3
SELECT count(*) WHERE {
?x0 a ns:film.writer .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
M2 ns:film.film.edited_by ?x0 .
M2 ns:film.film.executive_produced_by M3 .
M4 ns:film.film.edited_by ?x0 .
M4 ns:film.film.executive_produced_by M3
}