question: Did M1 employ M0 's prequel 's director and employ M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film ?x1 .
  ?x1 ns:film.film.sequel M0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person M2
  }