Filter Source Data in Excel with Slicer

I was recently answering a post on Ozgrid about filtering a list using a slicer.  The post was very similar to a blog post of mine with a slight twist.  The poster wanted the original list filtered based on the selection of the slicer and if no slicer item was selected then the filter was to be taken off the dataset.  I found the problem interesting because in order to solve the problem you had to know how many slicer items were in the list in the first place.

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