> There's some playfulness here, with duck typing, in that the parameter
> name suggests a set, yet we pass a string, then work with listifications.
> This allows more types of input, yet the output should always be: a dict,
> a mapping, a permutation. Running it now, I get:
>
> P1: {'1': '6', '
One of my favorite topics in mathematics which I think is accessible to
kids, is that of "permutations" treated as objects, and made to "compose".
To this I affix the notion of "substitution code" or "club house code", one
of the simplest ciphers imaginable, and we're off, studying Group Theory.
Th
