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    The state of the L{ConfigurationModel} as initially presented to the
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    L{ConfigurationModel} presents a model of configuration as the UI
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       1. Allow the expected behaviour in the UI without changing the live
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       2. Supersede the overly complex logic in the controller layer with a
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    The allowable state transitions are:

       VirginState      --(load_data)--> InitialisedState
       VirginState      --(load_data)--> ExitedState
       VirginState      --(exit)-------> ExitedState
       InitialisedState --(modify)-----> ModifiedState
       InitialisedState --(exit)-------> ExitedState
       ModifiedState    --(revert)-----> InitialisedState
       ModifiedState    --(modify)-----> ModifiedState
       ModifiedState    --(persist)----> InitialisedState
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