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