question: Which company whose employee was employed by and founded M2 , M3 , M4 , M5 , and M6 was acquired by M1
query: SELECT DISTINCT ?x0 WHERE {
  ?x0 a ns:business.employer .
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person ?x1 .
  ?x0 ns:organization.organization.acquired_by/ns:business.acquisition.acquiring_company M1 .
  ?x1 ns:organization.organization_founder.organizations_founded M2 .
  ?x1 ns:organization.organization_founder.organizations_founded M3 .
  ?x1 ns:organization.organization_founder.organizations_founded M4 .
  ?x1 ns:organization.organization_founder.organizations_founded M5 .
  ?x1 ns:organization.organization_founder.organizations_founded M6 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M2 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M3 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M4 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M5 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M6
  }