question: Did a writer of a film produce a film , edit M0 , and edit M1
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M0 .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.producer.film|ns:film.production_company.films ?x1 .
  ?x0 ns:film.writer.film ?x2 .
  ?x1 a ns:film.film .
  ?x2 a ns:film.film
  }