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 Undo allows you to undo actions you have done.
 Redo allows you to redo an action that you have undone.
Example:
| • | Open the 'Undo' drop-down menu. |
| • | Notice there is an undo entry for each wall drawn. |
| • | Click the second 'Created Wall' entry. |
| • | Notice 2 walls have been removed. |
| • | Click the 'Redo' drop-down menu. |
| • | Notice this menu contains the 2 undone walls. |
| • | Click the bottom 'Created Wall' entry. |
| • | Notice the 2 walls have been redone. |
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