question: Was M5 a person whose employer acquired M0 , M1 , M2 , M3 , and M4
query: SELECT count(*) WHERE {
  ?x0 ns:organization.organization.companies_acquired/ns:business.acquisition.company_acquired M0 .
  ?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 .
  M5 a ns:people.person .
  M5 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
  }