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