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In the navigation pane, select Revisions.
The Revisions page for the chapter opens.
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From the page toolbar, click Create Revision.
A new revision of the chapter is created in the "Private" state. The Revision column updates to indicate that the current chapter now has a higher revision available. The new chapter revision has all of the same relationships to its parent and child objects that the previous revision had.
After you have created the first revision of a comment, the Replace By New Revision and Replace By Last Revision commands are available from the Actions
menu.