Extracting Overlapping Parts of Single Polygon Layer using QGIS?

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I have a single polygon layer with over 200 buffers with a lot of overlapping areas. I want to use QGIS to create a new layer representing the overlap. I've seen several questions that are similar, but haven't been able to figure it out yet. I'm new to QGIS, so I may be overlooking a simple solution.

I'd like to save out the red overlap from this example:



From this question:Remove overlapping buffers

Similar to this question, but I'm using QGIS 2.8.1how to extract overlap from non-dissolved buffer zones in qgis 1.7.4



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