question: Was M1 written by a art director , executive produced by M2 and M3 , and executive produced by M4 , M5 , and M6
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film_art_director .
  M1 ns:film.film.executive_produced_by M2 .
  M1 ns:film.film.executive_produced_by M3 .
  M1 ns:film.film.executive_produced_by M4 .
  M1 ns:film.film.executive_produced_by M5 .
  M1 ns:film.film.executive_produced_by M6 .
  M1 ns:film.film.written_by ?x0
  }