question: Did M5 employ M6 , employ a actor , and employ a writer of M1 , M2 , M3 , and M4
query: SELECT count(*) WHERE {
  ?x0 a ns:film.actor .
  ?x1 ns:film.writer.film M1 .
  ?x1 ns:film.writer.film M2 .
  ?x1 ns:film.writer.film M3 .
  ?x1 ns:film.writer.film M4 .
  M5 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M5 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  M5 ns:business.employer.employees/ns:business.employment_tenure.person M6
  }