question: Who was employed by M1 and M2 , founded M3 , M4 , and M5 , and founded M6 and M7
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:people.person .
  ?x0 ns:organization.organization_founder.organizations_founded M3 .
  ?x0 ns:organization.organization_founder.organizations_founded M4 .
  ?x0 ns:organization.organization_founder.organizations_founded M5 .
  ?x0 ns:organization.organization_founder.organizations_founded M6 .
  ?x0 ns:organization.organization_founder.organizations_founded M7 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  ?x0 ns:people.person.employment_history/ns:business.employment_tenure.company M2
  }