question: What costume designer of M4 , M5 , and M6 was employed by M0 and M1 and employed by M2 and M3
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.film_costumer_designer.costume_design_for_film M4 .
  ?x0 ns:film.film_costumer_designer.costume_design_for_film M5 .
  ?x0 ns:film.film_costumer_designer.costume_design_for_film M6 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0 .
  ?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
  }