question: Did a country of nationality of M2 employ M0 and employ M1
query: SELECT count(*) WHERE {
  ?x0 ^ns:people.person.nationality M2 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M0 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M1
  }