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How to duplicate slides in powerpoint
Open your powerpoint presentation if it isn't already open.
To do so, either double-click the presentation file, or open powerpoint and select the file's name from the left side of the window.
Find the slide you wish to duplicate in the sidebar.
The column of slides in the left pane of the powerpoint window displays all slides in your powerpoint presentation. Right-click your slide's icon in the sidebar.