question: Which company employed M3 , M4 , and M5 , was founded by M1 and M2 , and employed M6
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:business.employer .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M4 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M5 .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M6 .
  ?x0 ns:organization.organization.founders M1 .
  ?x0 ns:organization.organization.founders M2
  }