question: Was M2 edited by M3 and M4 , written by M0 's writer , and edited by a person
query: SELECT count(*) WHERE {
  ?x0 ns:film.writer.film M0 .
  ?x1 a ns:people.person .
  M2 ns:film.film.edited_by ?x1 .
  M2 ns:film.film.edited_by M3 .
  M2 ns:film.film.edited_by M4 .
  M2 ns:film.film.written_by ?x0
  }