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The figure shows the DEMO (Model} sheet after it has been created but before it has been configured for solution.  The numbered buttons declare the configuration tasks to be completed in order.  After the numbered button tasks have been completed, the buttons are removed from the sheet and the {Solver parameters} sheet is removed (parameters for the Solver are taken up when the [3. Install Solver] button is clicked).  Yellow cells contain equations while white cells contain exogenous data that can be changed to generate alternative solutions.  Documentation or other information can be added in unused parts of the model sheet in cells or in textboxes as shown above.