Who was a screenwriter whose employer was acquired by M2 and M3 and was acquired by M4
SELECT DISTINCT ?x0 WHERE {
?x0 a ns:film.writer .
?x0 a ns:people.person .
?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
?x1 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M2 .
?x1 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M3 .
?x1 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M4
}