question: Did M4 employ a cinematographer and editor of M0 , M1 , M2 , and M3
query: SELECT count(*) WHERE {
  ?x0 ns:film.cinematographer.film M0 .
  ?x0 ns:film.cinematographer.film M1 .
  ?x0 ns:film.cinematographer.film M2 .
  ?x0 ns:film.cinematographer.film M3 .
  ?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 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }