question: Did M1 and M6 edit a film and executive produce M2 , M3 , M4 , and M5
query: SELECT count(*) WHERE {
  ?x0 a ns:film.film .
  M1 ns:film.editor.film ?x0 .
  M1 ns:film.producer.films_executive_produced M2 .
  M1 ns:film.producer.films_executive_produced M3 .
  M1 ns:film.producer.films_executive_produced M4 .
  M1 ns:film.producer.films_executive_produced M5 .
  M6 ns:film.editor.film ?x0 .
  M6 ns:film.producer.films_executive_produced M2 .
  M6 ns:film.producer.films_executive_produced M3 .
  M6 ns:film.producer.films_executive_produced M4 .
  M6 ns:film.producer.films_executive_produced M5
  }