question: Was M0 a company that was acquired by M2 , was acquired by M3 and M4 , and was acquired by M5
query: SELECT count(*) WHERE {
  M0 a ns:business.employer .
  M0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M2 .
  M0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M3 .
  M0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M4 .
  M0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M5
  }