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Then you'd need to apply the appropriate layout to each slide that was originally based on it and finally, if need be, copy text from random text boxes into the appropriate placeholders. That would involve doing the above, then going through the layouts and deleting any content that's not either a) a placeholder or b) wanted on every slide based on the layout. If the presentation will be used on more than just a few occasions and edited by a variety of people, a more complete fix might be more appropriate, even though a lot more time-consuming. But it's a relatively quick fix, and will at least leave you with editable slides. To make any wide-ranging changes, you'd need to change each and every slide. The flaw? This'll give you a bunch of slides that are no longer connected to layouts that'll control the appearance of the presentation. Once done with all the layouts, go back to master view, select and delete the contents from each layout. Press Ctrl+V to paste the content you just copied from the layout

Add a new slide based on the BLANK layout
