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Undo and Redo
You can choose Edit > Undo any number of times, until you are back to the state of the document the last time it was saved (or until the document is blank, if it has never been saved). Undo affects only the data; it does not affect selection actions, views, windows, defaults, etc. Any menu command, keyboard, or mouse action which affects the data in the drawing can be Undone.
You can Edit > Redo any number of times, until the last action which you Undid has been Redone. You can go back and forth between Undo and Redo. But if youve Undone one or more times and then perform some action on the data, you can no longer Redo the actions which you previously Undid.
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