What founder of M1 , M2 , and M3 was M0 's executive producer
SELECT DISTINCT ?x0 WHERE {
?x0 ns:film.producer.films_executive_produced M0 .
?x0 ns:organization.organization_founder.organizations_founded M1 .
?x0 ns:organization.organization_founder.organizations_founded M2 .
?x0 ns:organization.organization_founder.organizations_founded M3
}