scratch

root
int1
int2
int3
leaf

___________________

int2 -> int1 -> int3 ->root -> leaf

map<cert:ca> certsMap{
  int2:int1
  int1:root
  int3:int2
  leaf:int3
}

for cert in keyset(certsMap) {
  import(cert)
}

private import(cert) {
  ca = certmap(cert)
  if (certmap.contains(ca) {
    import(ca)
  }
  setInCredhub(cert)
  certmap.delete(cert)
}