You're not alone =)

Yeah, I honestly have no idea what my train of thought there was haha. It was a decent while ago, I suspect during the period when I was mindlessly going through a number of 8 & 7 kyu kata without giving them much attention. That's likely why the semicolon at the end of that line is missing as well.

As regex is not enforced, it's a valid solution ;-)

Yep. My guess is I did it this way because the requirements were very low.

Not a kata issue, the tests are ok, the pattern is something like this (if there were only 3 persons that is, I didn't want to write a lot):

["a", "b", "c"] ->
["a", "b", "c", "a", "a", "b", "b", "c", "c"] ->
["a", "b", "c", "a", "a", "b", "b", "c", "c", "a", "a", "a", "a", "b", "b", "b", "b", "c", "c", "c", "c"] -> ...

and for n = 52, Penny is the right answer.

I think it fails for "0", doesn't it?