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