question: Did M0 employ M1 , employ M2 , employ M3 , and employ M4
query: SELECT count(*) WHERE {
  M0 ns:business.employer.employees/ns:business.employment_tenure.person M1 .
  M0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  M0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  M0 ns:business.employer.employees/ns:business.employment_tenure.person M4
  }