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Raise duplicate key error only when key is accessed

This can be achieved by:

  • Creating new DuplicateKey object storing the key and all templates that that key refers to.
  • Adding DuplicateKey to the templates dictionary whenever a template is added to an already existing key.
  • Raising an error if a DuplicateKey is accessed.
  • Ensure that any entries with DuplicateKey are ignores/included when iterating over templates as appropriate.