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Suddenly, I Was Teaching Perl!

I whipped together a course using HTML slides whose order was controlled with a simple plain-text file:

    lists.slide.txt
    arrays.slide.txt
    last_index.slide.txt
    qw.slide.txt
    list_assignment.slide.txt

I was constantly comparing the list of file names above with the files I had actually created in the current working directory.
- Which slides were present?
- Which slides were missing?
- Which slides were unused?
I figured there must be some standard recipe for comparing lists. There is.