question: Were M2 , M3 , and M4 founded by a employee and founder of M1 and founded by a person
query: SELECT count(*) WHERE {
  ?x0 a ns:people.person .
  ?x1 ns:organization.organization_founder.organizations_founded M1 .
  ?x1 ns:people.person.employment_history/ns:business.employment_tenure.company M1 .
  M2 ns:organization.organization.founders ?x0 .
  M2 ns:organization.organization.founders ?x1 .
  M3 ns:organization.organization.founders ?x0 .
  M3 ns:organization.organization.founders ?x1 .
  M4 ns:organization.organization.founders ?x0 .
  M4 ns:organization.organization.founders ?x1
  }