question: Which founder of M0 , M1 , and M2 was a Canadian director of M4 , M5 , M6 , and M7
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:film.director.film M4 .
  ?x0 ns:film.director.film M5 .
  ?x0 ns:film.director.film M6 .
  ?x0 ns:film.director.film M7 .
  ?x0 ns:organization.organization_founder.organizations_founded M0 .
  ?x0 ns:organization.organization_founder.organizations_founded M1 .
  ?x0 ns:organization.organization_founder.organizations_founded M2 .
  ?x0 ns:people.person.nationality ns:m.0d060g
  }