It's amazing how simple the answer can be, and i'm here writing 18 lines of code :') . I need to learn more python...

Ok it's great to know that the find function accept more arguments, thanks

it's not nice, it's a cheat. Using this can lead to bannishment of the account.

Could you provide some explenation on how does it work?

Perhaps the coding is not that extreme, but it really puts your logical thinking and problem solving skills to the test. It deserves 4 Kyu

I found the sorting part trickier compared to what one would expect from a 5 or 6 kyu kata.

I mean, maybe they are afraid that their messages will get intercepted and decoded so they want to throw some invalid ones out there.

To people who already know the key they will be obvious gibberish.To people intercepting them they would get garbish that they spend hours trying to decode and are like WTF is this not decoding and it will throw all their algorithams off because they think they are valid.

I've implemented it myself and I still think it is a 6 kyu due to it being a very basic task. If you still strugling with permutations, you might find this helpful

https://www.youtube.com/watch?v=jUM_Dpt6yu0

The video gives an insight on how the algorithm works and the best part -- it is 19 minutes long and you can stop at any momemt if you seem to catch the idea.

well you can just try yourself to make a solution without numpy and without the determinat() method.
Took me a week, but i enjoyed it.
I´m still trying to make my own code for permutations ;)

@Kacarott, thank you for your response! I will familiarize myself with material, also thanks for sharing that kata!

I haven't read almost any books on Lambda Calculus, my learning was mostly from onlines sources or just practicing here. The one book I did read which was somewhat related (and very good) was To Mock a Mockingbird. Besides that, another resource you might find valuable is a very good presentation about LC. In fact, the presenter of that talk is actually a member of the Codewars community here and solves quite a few LC challenges.

By the way, if you didn't know, we've made a full esoteric style language out of LC, you should have a try of it. Example kata.

Well, I've studied lambda-calculus during me first term at the university and that almost left no mark in my memory or my brain but I saw kinda the beaty of Haskell even tho that never got far. This Kata shurely inspired me to dive into it and since you seem to be good at it, may I ask you to advise a classical book on lambda calculus?