question: Was M1 written by M2 , M3 , M4 , and M5 , written by M6 and M7 , and edited by a person
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  M1 ns:film.film.edited_by ?x0 .
  M1 ns:film.film.written_by M2 .
  M1 ns:film.film.written_by M3 .
  M1 ns:film.film.written_by M4 .
  M1 ns:film.film.written_by M5 .
  M1 ns:film.film.written_by M6 .
  M1 ns:film.film.written_by M7
  }