Thanks for your kind feed, albeit I fear I will disappoint you sooner or later, as I try to diversify my interest (and my offer to my trainees) in katas, ranging from very basic to more advanced katas, so not to easy to stay that palatable.

Just be sure to tell me what I do wrong, anyway :)

Thanks for your kind feed too, Hadron :)

It was a mistake on my part. Well spotted, thanks.

Yup, I think this kata's whole point was code efficiency.