question: Was M2 employed by M0 's employer , employed by M3 , and employed by a company
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
  ?x1 a ns:business.employer .
  M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0 .
  M2 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  M2 ns:people.person.employment_history/ns:business.employment_tenure.company M3
  }