question: Was M1 directed by a film editor , edited by M5 , M6 , and M7 , and written by M2 , M3 , and M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  M1 ns:film.film.directed_by ?x0 .
  M1 ns:film.film.edited_by M5 .
  M1 ns:film.film.edited_by M6 .
  M1 ns:film.film.edited_by M7 .
  M1 ns:film.film.written_by M2 .
  M1 ns:film.film.written_by M3 .
  M1 ns:film.film.written_by M4
  }