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excellent -- love this format.

Books ain't making their authors money anyway, so might as well align with the ethos and give them away

They can, sometimes. I made decent money on this one:

SQL Practice Problems: 57 beginning, intermediate, and advanced challenges for you to solve using a “learn-by-doing” approach.

(You may notice a certain similarity in subtitle to my bitcoin book (https://www.amazon.com/dp/B0F4SZSCH8)

But you're right, most of the time they don't.

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