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This kind of thing is not new. My college professors some 40 years ago would supplement their salary by writing text books that were required purchases in the class. To avoid the students being able to use and purchase used books they would frequently revise the text. Students learned that you did not buy your books until after the first day of class since some teachers didn't even need the book but it was listed on the syllabus because the department dean wrote it.
Dale
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