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