question: Was M4 a production company whose founder edited M0 , M1 , M2 , and M3
query: SELECT count(*) WHERE {
  ?x0 ns:film.editor.film M0 .
  ?x0 ns:film.editor.film M1 .
  ?x0 ns:film.editor.film M2 .
  ?x0 ns:film.editor.film M3 .
  M4 a ns:film.production_company .
  M4 ns:organization.organization.founders ?x0
  }