question: Was M3 employed by a production company acquired by M1 and M2 and employed by M4 and M5
query: 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 .
  M3 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
  M3 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
  M3 ns:people.person.employment_history/ns:business.employment_tenure.company M5
  }