question: Were M2 , M5 , M6 , and M7 produced by M1 's British editor and edited by M3 and M4
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  M2 ns:film.film.edited_by M3 .
  M2 ns:film.film.edited_by M4 .
  M2 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M5 ns:film.film.edited_by M3 .
  M5 ns:film.film.edited_by M4 .
  M5 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M6 ns:film.film.edited_by M3 .
  M6 ns:film.film.edited_by M4 .
  M6 ns:film.film.produced_by|ns:film.film.production_companies ?x0 .
  M7 ns:film.film.edited_by M3 .
  M7 ns:film.film.edited_by M4 .
  M7 ns:film.film.produced_by|ns:film.film.production_companies ?x0
  }