question: What screenwriter that M4 and M5 were founded by and M1 , M2 , and M3 employed did M6 and M7 star
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:film.writer .
  ?x0 ns:film.actor.film/ns:film.performance.film M6 .
  ?x0 ns:film.actor.film/ns:film.performance.film M7 .
  ?x0 ns:organization.organization_founder.organizations_founded M4 .
  ?x0 ns:organization.organization_founder.organizations_founded M5 .
  ?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
  }