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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.
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So once you figure out the problem (I recommend looking at @user6871864's message), the possible solutions are quite interesting and varied.
Dear creator, please update your description.
Great explanation. Thank you.
Love this kata :)
The description of this kata needs work because it's unclear how k is determined, especially since it is not a parameter of the method.