question: Was M2 directed by a British film editor , edited by M3 , M4 , and M5 , and edited by M6
query: SELECT count(*) WHERE {
  ?x0 a ns:film.editor .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  M2 ns:film.film.directed_by ?x0 .
  M2 ns:film.film.edited_by M3 .
  M2 ns:film.film.edited_by M4 .
  M2 ns:film.film.edited_by M5 .
  M2 ns:film.film.edited_by M6
  }