question: Did M1 and M4 employ M2 , employ a founder of M0 , and employ M3
query: SELECT count(*) WHERE {
  ?x0 ns:organization.organization_founder.organizations_founded M0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  M1 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  M4 ns:business.employer.employees/ns:business.employment_tenure.person ?x0 .
  M4 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  M4 ns:business.employer.employees/ns:business.employment_tenure.person M3
  }