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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.
Get started now by creating a new collection.
Also as much as I agree with you in JS or python, the difficulty here is quite language dependant
Ranks can"t be changed
Too easy, should be a 7 kyu.
after weeks suffering for barely completing a kyu 6 kata this one really feels off. Should be a 7 or 6 kyu max.