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Or, if you prefer to make a one-time payment, you can do so by using the PalPal "Donate" button on my website:
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At my website you can find links to playlists for all the video series, with series on similar topics arranged in suggested viewing order, as well as printable documents containing the "handouts" or problems discussed in the videos.

I am not an expert on the topics covered in these videos. The videos may contain errors; viewer beware.