question: Was a person whose employer was founded by M0 , M1 , and M2 and employed M3 M4
query: SELECT count(*) WHERE {
  ?x0 ns:business.employer.employees/ns:business.employment_tenure.person M3 .
  ?x0 ns:organization.organization.founders M0 .
  ?x0 ns:organization.organization.founders M1 .
  ?x0 ns:organization.organization.founders M2 .
  M4 a ns:people.person .
  M4 ns:people.person.employment_history/ns:business.employment_tenure.company ?x0
  }