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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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I feel that this kata is free elo. It is way too easy for 2nd kyu kata. In every other language You have to sweat a lot to find/write solution for 2nd kyu kata (personal opinion). I was just starting in OCaml (8 kyu) and while looking for suitable kata for me i found this. Firstly i thought that there is going to be a trap somewhere and I will spend a lot of time solving it, but i got a little bit upset when i didn't find any. It feels more like 5th/6th kyu katas (easier ones from them) than 2nd kyu…