Uniqueness would be anything that starts with a capital letter from Topology to the next Topology and if the node differs from the previous one. I would like to retain the one prior, for example if I have:

  Topology
  IPClassA
  subnet_address=0
  Topology
  IPClassA
  Device
  model_name=1
  Topology
  IPClassB
  Device
  model_name=2
  Topology
  IPClassB
  Device
[download]

I would like to end up with:

  Topology
  IPClassA
  subnet_address=0
  Device
  model_name=1
  Topology
  IPClassB
  Device
  model_name=2
  Device
[download]