question: Were M2 and M4 edited by a screenwriter employed by M1 and executive produced by M3
query: 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
  }