question: Was M2 executive produced by a editor of M0 , executive produced by M3 , and directed by a film editor
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M0 .
  ?x1 a ns:film.editor .
  M2 ns:film.film.directed_by ?x1 .
  M2 ns:film.film.executive_produced_by ?x0 .
  M2 ns:film.film.executive_produced_by M3
  }