Was M4 produced by a company that M1 , M2 , and M3 acquired
SELECT count(*) WHERE {
?x0 a ns:business.employer .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M1 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M2 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M3 .
M4 ns:film.film.produced_by|ns:film.film.production_companies ?x0
}