question: Was M1 executive produced by M2 , directed by M4 , written by M3 , and directed by a film 's writer
query: SELECT count(*) WHERE {
  ?x0 ns:film.writer.film ?x1 .
  ?x1 a ns:film.film .
  M1 ns:film.film.directed_by ?x0 .
  M1 ns:film.film.directed_by M4 .
  M1 ns:film.film.executive_produced_by M2 .
  M1 ns:film.film.written_by M3
  }