question: Was a company acquired by M2 , acquired by M3 and M4 , and acquired by M5 and M6 M0
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 .
  M0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M6
  }