What production company that was acquired by M2 , M3 , and M4 and was acquired by M5 and M6 did M1 found
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.production_company .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M2 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M3 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M4 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M5 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M6 .
?x0 ns:organization.organization.founders M1
}