question: Which employer of M2 and M3 was founded by M0 and M1
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M2 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  ?x0 ns:organization.organization.founders M0 .
  ?x0 ns:organization.organization.founders M1
  }