What film producer that M1 and M2 founded was a employer of M3 and M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.producer .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
?x0 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
?x0 ns:organization.organization.founders M1 .
?x0 ns:organization.organization.founders M2
}