This text was adapted by Jeff Lingwall under the same license and from a text adapted by Saylor Academy under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License without attribution as requested by the work's original creator or licensor. Some additions to the text have specific license terms (such as the XKCD comics scattered throughout the text).
Saylor Academy would like to thank Andy Schmitz for his work in maintaining and improving the HTML versions of these textbooks. This textbook is adapted from his HTML version, and his project can be found here.
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