question: Were M1 and M7 directed by M2 and M3 , edited by a film editor , and directed by M4 , M5 , and M6
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  M1 ns:film.film.directed_by M2 .
  M1 ns:film.film.directed_by M3 .
  M1 ns:film.film.directed_by M4 .
  M1 ns:film.film.directed_by M5 .
  M1 ns:film.film.directed_by M6 .
  M1 ns:film.film.edited_by ?x0 .
  M7 ns:film.film.directed_by M2 .
  M7 ns:film.film.directed_by M3 .
  M7 ns:film.film.directed_by M4 .
  M7 ns:film.film.directed_by M5 .
  M7 ns:film.film.directed_by M6 .
  M7 ns:film.film.edited_by ?x0
  }