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