In documentation.brightspace.com, it seems it is possible to restore a deleted discussion post that

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Link to current documentation for instructors to restore deleted discussion post: https://documentation.brightspace.com/EN/le/discussions/instructor/restore_deleted_discussions.htm?Highlight=restore discussion I don't see a separate config variable that would allow students to delete and restore their own posts (ideal) or for an instructor to restore a post that has been deleted by the student (next best).  

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