Exercises and solutions from the same source, into a book
The packageThe exsol package provides macros to allow for embedding exercises and solutions in the LaTeX source of an instructional text (e.g., a book or a course text) while generating the following separate documents: your original text that only contains the exercises, and a solution book that contains only the solutions to the exercises (optionally, the exercises themselves are also copied to the solution book). The exercise data are generated when running LaTeX on your document; the first run also writes the solutions to a secondary file that may be included in a simple document harness, may be processed by LaTeX, to generate a nice solution book. The code of the package was derived (in large part) from fancyvrb.
You can contact the maintainers of this package via email at
texlive dash maintainers at fedoraproject dot org.