how do you combine two powerpoint presentations with different backgrounds

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1. How to Combine Multiple PowerPoint Presentations in PowerPoint 2013

   

2. How to Combine Multiple PowerPoint Presentations in PowerPoint 2013

   

3. How to Combine Multiple PowerPoint Presentations in PowerPoint 2013

   

4. How to Combine PowerPoint Presentations

   

5. How to combine multiple PowerPoint Presentations

   

6. Combine PowerPoint PPT Presentation Files Quickly (+Video)