question: Did M0 's employer employ M1 's director and editor
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
  ?x1 ns:film.director.film M1 .
  ?x1 ns:film.editor.film M1
  }