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Deleted course content can often be restored:
- Go the the Home page of your course.
- Type /undelete In the address bar at the end of the course URL

- Press Enter/Return.
- The page that loads will contain a list of recently deleted items with a restore button.
- Find the item you want to restore and click the Restore button.

- Click OK to confirm the item you're restoring.
The item will be restored to it's original location in the course.