question: Were M4 , M5 , and M6 founded by a film director whose employer employed M1 , M2 , and M3
query: SELECT count(*) WHERE {
  ?x0 a ns:film.director .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  M4 ns:organization.organization.founders ?x0 .
  M5 ns:organization.organization.founders ?x0 .
  M6 ns:organization.organization.founders ?x0
  }