question: What person that M1 was founded by and a production company was founded by was a director of M2 , M3 , and M4
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:film.director.film M2 .
  ?x0 ns:film.director.film M3 .
  ?x0 ns:film.director.film M4 .
  ?x0 ns:organization.organization_founder.organizations_founded ?x1 .
  ?x0 ns:organization.organization_founder.organizations_founded M1 .
  ?x1 a ns:film.production_company
  }