question: Did M3 employ M4 , M5 , and M6 and employ a writer of M0 , M1 , and M2
query: SELECT count(*) WHERE {
  ?x0 ns:film.writer.film M0 .
  ?x0 ns:film.writer.film M1 .
  ?x0 ns:film.writer.film M2 .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
  M3 ns:business.employer.employees/ns:business.employment_tenure.person M6
  }