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