question: Who did a company whose founder founded M5 employ , M1 employ , and M2 and M3 employ
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company ?x1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
  ?x1 a ns:business.employer .
  ?x1 ns:organization.organization.founders ?x2 .
  ?x2 ns:organization.organization_founder.organizations_founded M5
  }