question: Did M1 employ a person and employ a person
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x1 a ns:people.person .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x1
  }