question: Did M2 and M4 acquire a employer of M0 and M1 and acquire M3
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
  M2 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired ?x0 .
  M2 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M3 .
  M4 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired ?x0 .
  M4 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M3
  }