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		<a href="https://wordsandbuttons.online/SYTYKC.pdf">So You Think You Know C</a> <span style="color:#888; font-size: 12pt;">(free book)</span></nobr><br>
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		<a href="https://www.amazon.com/Geometry-Programmers-Oleksandr-Kaleniuk/dp/1633439607">Geometry for Programmers</a> <span style="color:#888; font-size: 12pt;">(paid book)</span></nobr><br>
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