question: Was a company that was founded by M1 and was founded by M2 founded by M3 and founded by M4
query: SELECT count(*) WHERE {
  ?x0 a ns:business.employer .
  ?x0 ns:organization.organization.founders M1 .
  ?x0 ns:organization.organization.founders M2 .
  ?x0 ns:organization.organization.founders M3 .
  ?x0 ns:organization.organization.founders M4
  }