question: Did M1 edit M2 and M3 , edit a film , and executive produce M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  M1 ns:film.editor.film ?x0 .
  M1 ns:film.editor.film M2 .
  M1 ns:film.editor.film M3 .
  M1 ns:film.producer.films_executive_produced M4
  }