question: Which company acquired M1 , M2 , M3 , M4 , and M5 , acquired M6 , and acquired a company
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:business.employer .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired ?x1 .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M1 .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M2 .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M3 .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M4 .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M5 .
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M6 .
  ?x1 a ns:business.employer
  }