question: Was M2 executive produced by M3 and M4 , produced by a person , and directed by a writer of M1
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x1 ns:film.writer.film M1 .
  M2 ns:film.film.directed_by ?x1 .
  M2 ns:film.film.executive_produced_by M3 .
  M2 ns:film.film.executive_produced_by M4 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }