question: Was M2 written by a cinematographer and director of M0 and M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.cinematographer.film M0 .
  ?x0 ns:film.cinematographer.film M1 .
  ?x0 ns:film.director.film M0 .
  ?x0 ns:film.director.film M1 .
  M2 ns:film.film.written_by ?x0
  }