question: Who was a art director whose employer employed M4 , M5 , and M6 and was founded by M2 and M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.film_art_director .
  ?x0 a ns:people.person .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
  ?x1 ns:business.employer.employees/ns:business.employment_tenure.person M6 .
  ?x1 ns:organization.organization.founders M2 .
  ?x1 ns:organization.organization.founders M3
  }