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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.
It's not a problem with the test cases, they should remove it from the instructions because it doesn't make a difference.
It's not possible to write test cases for that because it doesn't make a difference. They should remove it from the instructions instead.
This is a math question, not a coding question.
Please write an actual description instead of just linking to wikipedia.
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