Were M6 and M7 employed by a production company that M1 , M2 , M3 , M4 , and M5 acquired
SELECT count(*) WHERE {
?x0 a ns:film.production_company .
?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 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M4 .
?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M5 .
M6 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
M7 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
}