question: Did M6 employ a British director of M1 , M2 , M3 , M4 , and M5
query: SELECT count(*) WHERE {
  ?x0 ns:film.director.film M1 .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.director.film M4 .
  ?x0 ns:film.director.film M5 .
  ?x0 ns:people.person.nationality ns:m.07ssc .
  M6 ns:business.employer.employees/ns:business.employment_tenure.person ?x0
  }