question: Did M2 employ M3 , M4 , M5 , and M6 , employ a Canadian person , and employ M7
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:people.person.nationality ns:m.0d060g .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person M6 .
  M2 ns:business.employer.employees/ns:business.employment_tenure.person M7
  }