What founder of M1 , M2 , M3 , and M4 was employed by M0
SELECT DISTINCT ?x0 WHERE {
?x0 ns:organization.organization_founder.organizations_founded M1 .
?x0 ns:organization.organization_founder.organizations_founded M2 .
?x0 ns:organization.organization_founder.organizations_founded M3 .
?x0 ns:organization.organization_founder.organizations_founded M4 .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M0
}