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