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