question: Did M1 and M2 employ a art director 's country of nationality 's employee
query: SELECT count(*) WHERE {
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x1 ^ns:people.person.nationality ?x2 .
  ?x2 a ns:film.film_art_director .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }