Files authored by Thomas P. K. Healy:
    main.cpp
    Makefile
    README.txt

Files taken from 3rd party open-source repositories:
    generator.hpp

This program is written to the C++ standard of 2020.

As this program uses coroutines, older compilers won't work.
If you're using the GNU compiler suite, you need at least
version 10, but ideally you should use version 11.

To build the program:

    make

To run the program:

    prog.exe