question: Did a British actor that edited M1 , M2 , M3 , M4 , and M5 produce and edit M6
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.editor.film M3 .
  ?x0 ns:film.editor.film M4 .
  ?x0 ns:film.editor.film M5 .
  ?x0 ns:film.editor.film M6 .
  ?x0 ns:film.producer.film|ns:film.production_company.films M6 .
  ?x0 ns:people.person.nationality ns:m.07ssc
  }