question: Was M1 acquired by M2 and M3 and acquired by a company
query: SELECT count(*) WHERE {
  ?x0 a ns:business.employer .
  M1 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company ?x0 .
  M1 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M2 .
  M1 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M3
  }